P: X → YP: ?C: not Y → Z

Levena June 17, 2019

Mistake

The explication added a D instead of the proper letter for the answer explanation.

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Ravi June 17, 2019

@Levena, thank you for bringing this to our attention. I've alerted the technical team, and they are working on correcting the typo. Let us know if you have any questions!