December 2014 LSAT Section 2 Question 18

If Heideck is assigned to the same graduation ceremony as Lai, then which one of the following must be true?

Kanyin on July 1, 2019

What is wrong with this set up

S: GM T: FHLK I've double checked (but very likely could be missing something) and it doesn't break any rules, however, it is not reflected in your video explanation.

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Ravi on July 1, 2019

@Kanyin,

Happy to help. Let's take a look.

Your setup is valid; however, it's not the only possible world in
which H and L are in the same ceremony.

Here's another possibility:

S: FHL
T: KGM

In both your world and this one, we see that K is in T, so this is why
(D) must be true.

Does this make sense? Let us know if you have any questions!