72 LR Two Question 19
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Permalink Submitted by MarkAnnett on Jan 19 2019
Why did you refer to this as an inference question rather than a parallel question? Am I correct that this is a parallel question?

Permalink Submitted by Carlo Aguirre on Mar 24 2020
can you explain/diagram the significance of "and only then" that makes it go both ways a bit more, i wouldn't have though to put A->PO lastly