This sort of question is intimidating, but with a bit of forethought, it's often not so hard. We need something that will determine the entire game. Let's consider the tools at hand: a YZ chunk, and a conditional rule that can require a TW chunk. The remaining element, X, is already placed, so no need to worry about it. What we need is an answer that forces the YZ chunk somewhere while also triggering the TW chunk rule. The only way to trigger that rule is to place T with S.
Indeed, if we place T with S, W is there, and since we need an element in each group, we'll have to put the YZ chunk in the P group. Voila!