Help with PT94.S1.G4 - A book collector is trying to decide...

legallylibra

Hi! For those who have completed PT 94, can someone please explain game 4 for me? I think I diagrammed my rules correctly but the questions literally destroyed me.

Thank you so much in advance!

mtakesLSAT

So, I got 2 of them wrong for that section. But I know this PT was kind of difficult because no explanations are really up yet. So as far as my understanding of it goes, I used an In and Out game board. I saw another person who mentioned that they chained up the rules. For myself, I found it easier to just write them out like this:
1. C&M -> P
2. P or S -> /R
3. /T -> M & R
From there, I personally had trouble with 18 and 22. For the rest, I basically put in my "in" side whatever scenario the question gave me, and then see what rules triggered what (contrapositives included). For the must be true questions I tried filling out my chart as much as possible, crossing out whatever didn't appear on my chart and seeing if I could find my answers (which I mostly was able to), that way. Kind of the same thing with the could be trues. I hope this somewhat helps!