62 RC Passage 3

Your rating: None Average: 5 (1 vote)
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30 Game 1
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30 Game 2
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30 Game 3
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30 Game 4
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30 RC Passage 1
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30 RC Passage 2
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30 RC Passage 3
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30 RC Passage 4
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31 Game 1
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31 Game 2
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31 Game 3
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31 Game 4
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31 RC Passage 1
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31 RC Passage 2
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31 RC Passage 3
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31 RC Passage 4
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32 Game 1
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32 Game 2
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32 Game 3
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32 Game 4
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32 RC Passage 1
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32 RC Passage 2
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32 RC Passage 3
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32 RC Passage 4
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33 Game 1
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33 Game 2
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33 Game 3
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33 Game 4
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33 RC Passage 1
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33 RC Passage 2
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33 RC Passage 3
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33 RC Passage 4
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34 Game 2
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34 Game 3
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34 Game 4
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34 RC Passage 1
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34 RC Passage 2
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34 RC Passage 3
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34 RC Passage 4
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35 Game 1
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35 Game 2
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35 Game 3
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35 Game 4
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35 RC Passage 1
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35 RC Passage 2
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35 RC Passage 3
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35 RC Passage 4
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36 Game 1
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36 Game 2
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36 Game 3
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36 Game 4
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36 RC Passage 1
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36 RC Passage 2
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36 RC Passage 3
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36 RC Passage 4
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37 Game 1
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37 Game 2
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37 Game 3
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37 Game 4
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37 RC Passage 1
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37 RC Passage 2
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37 RC Passage 3
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37 RC Passage 4
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38 Game 1
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38 Game 2
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38 Game 3
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38 Game 4
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38 RC Passage 1
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38 RC Passage 2
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38 RC Passage 3
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38 RC Passage 4
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39 Game 1
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39 Game 2
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39 Game 3
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39 Game 4
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39 RC Passage 1
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39 RC Passage 2
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39 RC Passage 3
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39 RC Passage 4
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40 Game 1
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40 Game 2
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40 Game 3
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40 Game 4
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40 RC Passage 1
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40 RC Passage 2
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40 RC Passage 3
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40 RC Passage 4
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41 Game 1
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41 Game 2
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41 Game 3
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41 Game 4
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41 RC Passage 1
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41 RC Passage 2
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41 RC Passage 3
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41 RC Passage 4
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42 Game 1
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42 Game 2
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42 Game 3
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42 Game 4
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42 RC Passage 1
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42 RC Passage 2
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42 RC Passage 3
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42 RC Passage 4
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43 Game 1
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43 Game 2
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43 Game 3
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43 Game 4
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43 RC Passage 1
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43 RC Passage 2
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43 RC Passage 3
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43 RC Passage 4
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44 Game 1
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44 Game 2
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44 Game 3
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44 Game 4
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44 RC Passage 1
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44 RC Passage 2
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44 RC Passage 3
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44 RC Passage 4
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45 Game 1
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45 Game 2
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45 Game 3
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45 Game 4
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45 RC Passage 1
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45 RC Passage 2
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45 RC Passage 3
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45 RC Passage 4
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46 Game 1
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46 Game 2
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46 Game 3
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46 Game 4
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46 RC Passage 1
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46 RC Passage 2
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46 RC Passage 3
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46 RC Passage 4
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47 Game 1
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47 Game 2
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47 Game 3
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47 Game 4
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47 RC Passage 1
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47 RC Passage 2
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47 RC Passage 3
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47 RC Passage 4
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48 Game 1
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48 Game 2
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48 Game 3
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48 Game 4
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48 RC Passage 1
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48 RC Passage 2
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48 RC Passage 3
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48 RC Passage 4
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49 Game 1
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49 Game 2
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49 Game 3
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49 Game 4
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49 RC Passage 1
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49 RC Passage 2
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49 RC Passage 3
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49 RC Passage 4
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50 Game 1
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50 Game 2
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50 Game 3
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50 Game 4
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50 RC Passage 1
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50 RC Passage 2
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50 RC Passage 3
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50 RC Passage 4
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51 Game 1
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51 Game 2
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51 Game 3
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51 Game 4
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51 RC Passage 1
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51 RC Passage 2
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51 RC Passage 3
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51 RC Passage 4
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52 Game 1
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52 Game 2
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52 Game 3
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52 Game 4
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52 RC Passage 1
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52 RC Passage 2
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52 RC Passage 3
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52 RC Passage 4
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53 Game 1
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53 Game 2
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53 Game 3
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53 Game 4
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53 RC Passage 1
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53 RC Passage 2
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53 RC Passage 3
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53 RC Passage 4
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54 Game 1
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54 Game 2
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54 Game 3
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54 Game 4
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54 RC Passage 1
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54 RC Passage 2
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54 RC Passage 3
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54 RC Passage 4
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55 Game 1
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55 Game 2
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55 Game 3
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55 Game 4
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55 RC Passage 1
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55 RC Passage 2
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55 RC Passage 3
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55 RC Passage 4
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56 Game 1
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56 Game 2
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56 Game 3
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56 Game 4
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56 RC Passage 1
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56 RC Passage 2
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56 RC Passage 3
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56 RC Passage 4
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57 Game 1
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57 Game 2
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57 Game 3
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57 Game 4
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57 RC Passage 1
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57 RC Passage 2
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57 RC Passage 3
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57 RC Passage 4
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58 Game 1
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58 Game 2
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58 Game 3
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58 Game 4
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58 RC Passage 1
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58 RC Passage 2
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58 RC Passage 3
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58 RC Passage 4
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59 Game 1
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59 Game 2
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59 Game 3
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59 Game 4
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59 RC Passage 1
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59 RC Passage 2
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59 RC Passage 3
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59 RC Passage 4
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60 Game 1
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60 Game 2
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60 Game 3
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60 Game 4
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60 RC Passage 1
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60 RC Passage 2
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60 RC Passage 3
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60 RC Passage 4
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61 Game 1
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61 Game 2
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61 Game 3
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61 Game 4
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61 RC Passage 1
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61 RC Passage 2
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61 RC Passage 3
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61 RC Passage 4
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62 Game 1
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62 Game 2
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62 Game 3
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62 Game 4
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62 RC Passage 1
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62 RC Passage 2
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62 RC Passage 3
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62 RC Passage 4
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63 Game 1
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63 Game 2
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63 Game 3
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63 Game 4
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63 RC Passage 1
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63 RC Passage 2
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63 RC Passage 3
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63 RC Passage 4
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64 Game 1
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64 Game 2
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64 Game 3
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64 Game 4
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64 RC Passage 1
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64 RC Passage 2
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64 RC Passage 3
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64 RC Passage 4
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65 Game 1
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65 Game 2
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65 Game 3
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65 Game 4
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65 RC Passage 1
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65 RC Passage 2
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65 RC Passage 3
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65 RC Passage 4
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70 Game 1
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70 Game 2
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70 Game 3
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70 Game 4
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70 RC Passage 1
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70 RC Passage 2
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70 RC Passage 3
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70 RC Passage 4
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71 Game 1
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71 Game 2
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71 Game 3
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71 Game 4
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71 RC Passage 1
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71 RC Passage 2
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71 RC Passage 3
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71 RC Passage 4
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72 Game 1
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72 Game 2
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72 Game 3
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72 Game 4
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72 RC Passage 1
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72 RC Passage 2
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72 RC Passage 3
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72 RC Passage 4
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73 Game 1
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73 Game 2
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73 Game 3
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73 Game 4
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73 RC Passage 1
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73 RC Passage 2
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73 RC Passage 3
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73 RC Passage 4
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74 Game 1
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74 Game 2
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74 Game 3
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74 Game 4
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75 Game 1
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75 Game 2
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75 Game 3
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75 Game 4
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75 RC Passage 1
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75 RC Passage 2
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75 RC Passage 3
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75 RC Passage 4
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76 Game 1
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76 Game 2
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76 Game 3
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76 Game 4
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76 RC Passage 1
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76 RC Passage 2
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76 RC Passage 3
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76 RC Passage 4
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77 Game 1
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77 Game 2
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77 Game 3
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77 Game 4
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77 RC Passage 1
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77 RC Passage 2
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77 RC Passage 3
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77 RC Passage 4
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78 Game 1
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78 Game 2
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78 Game 3
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78 Game 4
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78 RC Passage 1
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78 RC Passage 2
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78 RC Passage 3
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78 RC Passage 4
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79 Game 1
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79 Game 2
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79 Game 3
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79 Game 4
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79 RC Passage 1
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79 RC Passage 2
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79 RC Passage 3
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79 RC Passage 4
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80 Game 1
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80 Game 2
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80 Game 3
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80 Game 4
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80 RC Passage 1
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80 RC Passage 2
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80 RC Passage 3
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80 RC Passage 4
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81 Game 1
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81 Game 2
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81 Game 3
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81 Game 4
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81 RC Passage 1
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81 RC Passage 2
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81 RC Passage 3
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81 RC Passage 4
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82 Game 1
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82 Game 2
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82 Game 3
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82 Game 4
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82 RC Passage 1
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82 RC Passage 2
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82 RC Passage 3
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82 RC Passage 4
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83 Game 1
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83 Game 2
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83 Game 3
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83 Game 4
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83 RC Passage 1
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83 RC Passage 2
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83 RC Passage 3
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83 RC Passage 4
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84 Game 1
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84 Game 2
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84 Game 3
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84 Game 4
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84 RC Passage 1
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84 RC Passage 2
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84 RC Passage 3
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84 RC Passage 4

Comments

Bridgetcongo's picture

HI Dave,

I have a question about Q18. At 3:54(ish) in the video you reference line 21 as support for the idea that passage A believes there is a relatively low incidence of caries among nonagricultural people.

Line 21 says "in general, the greater the population's dependance on agriculture is, the higher its rate of caries formation will be". So I understand that given this proportion we can extrapolate/assume non-agri means low caries (we can infer from a stated proportion that the opposite is true, correct?).

However, where I got confused is that in the next paragraph the authour seems to contradict this by saying there are exceptions, and it can been seen that non-agri has high caries.

So given the proportion from line 21 and the seeming contradiction to the inverse of that proportion, I crossed out B pretty quickly thinking the authour from A did not really agree there was low incidence of caries among non-agri people.

How do I reconcile this. What am I missing? Thanks :)

majorgeneraldave's picture

1. Yes, but it's hard for me to call it extrapolation; it's straight unassailable fact. If you draw a bar graph in which the measurement along the x axis rises alongside that on the y, you'll be able to literally see this phenomenon: If a line, (or series of points, or scatterplot, etc.) generally goes up forward, it must generally go down backward.

2. Sure, there are exceptions; the author made that clear in the preceding sentence by saying the proportion is generally true, not true without exception. As above (this time with special emphasis): If it generally goes up forward, it must generally go down backward.

michael222's picture

Hi Dave,

Thanks for this video explanation. I have a question about question 17. In your explanation of why (A) is correct, you say:

"I'm in line 45: 'wearing down your crown surfaces reduces caries formation.' Okay, so fibers and grit can reduce your caries formation. But in line 47 - 'if you eat less fiber and grit you can diminish your tooth wear and increase caries frequency.' ... eating some of it decreases, eating less of it increases, your caries formation."

Other explanations I've found online say the same; for e.g., by characterizing lines 44- 46 with "[Those lines] say that tooth wear from fiber helps prevent decay" ...

After oscillating between answer choices A and D, I chose D, because the question stem doesn't specify whether the fiber and grit's increase or decrease is in view; not seeing how A could be correct, I figured, "well, although the line says clearly that a decrease in F and G increases fissures," that's *still a statement about F and G in a diet* - and that's all the Q asks for.

Basically, my problem is that the description in passage B, line 42, doesn't seem to me to signal that it's F&D that are the stuff that causes the wearing down of teeth. Are we to assume (or perhaps it's general knowledge that I lack?) that F&G are "starchy-sticky" foodstuffs? Even so, that sentence says that increased frequency can result either from consuming that kind of food, or from alterations in tooth wear. The next sentence - the one you cite in your answer - then goes on to discuss tooth wear and does not mention any food as the source/cause of that wear. F&G are mentioned only in the next sentence.

What am I missing here? Grateful for your help.

majorgeneraldave's picture

I think the most important thing is that an answer choice you're not in love with will always be preferable to one that has no support within the passage. 

Here, there is nothing that indicates that fiber and grit contribute to the formation of fissures, so (D) cannot be correct.

However, the passage explicitly says that fiber and grit can increase caries (line 48), and the structure of the passage strongly suggests (as the question demanded it must) that fiber and grit also diminish it: 

We know that tooth wear reduces caries. We know that a reduction in fiber and grit diminishes tooth wear. Thus, it is strongly likely that an increase in fiber and grit causes tooth wear, thereby reducing caries.