PTB.S2.G2 - which is correct?

HLS JDJL · March 2022

03/18/2022: Hello everyone? I need to learn which is the correct contrapositive (3) below.
Could anyone help?

A park contains at most five of seven kinds of trees--firs, laurels, maples, oaks, pines, spruces, and yews --

Admin Note: deleted the question because it is against our Forum Rules to post full LSAT questions on the Forum.

Analysis:
Steps 1-4
F L M O P S Y (max 5)

1) If M, not Y
If Y, not M

2) If F, not P
If P, not F

3) If not Y, (Exactly one of L / O)
If L and O, Y (my question, it is supposed to be not Y isn't it)
If not L and not O, Y

4) If not L or not O, F and S
If not F or not S, L and O

Admin Note: https://7sage.com/lsat_explanations/lsat-b-section-2-game-2/

Steven_B-1 · March 2022

It would be if NOT L and NOT Q -> Y . Is it not?

HLS JDJL · March 2022

Yes, but my question is "If L and O," not Y , isn't it?

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