36 LR Two Question 17
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Comments

how would you make diagram for D?
Pre -> not art
Art -> not pre
?

I guess the most useful way of doing so would be to say [using whatever abbreviations make you happy]:
1. Purpose → Explain ALL art
do NOT Explain ALL art → do NOT achieve Purpose
2. Premodern → do NOT Explain ALL art (if we assume music is art)
∴ Premodern → do NOT achieve Purpose (unless we were wrong and music isn't art)

This makes sense to me. However, I'm curious like the other poster, how would you diagram AC D? Does the "unless music is not art" figure into it somehow? If it does, I think this is similar to my other question about "No X unless not Y" on how you would use the "unless procedure" to diagram it out.

With the word "unless" or "without" it's always the same procedure. Learn to make it mindless and mechanical:
1. No Theory Achieves Purpose
Music Not Art
2. → No Theory Achieves Purpose
→ Music Not Art
3. Music is Art → No Theory Achieves Purpose
Theory Achieves Purpose → Music Not Art
Note the similarity between this work and my response to your previous question. It's math! Really.