The Hasse diagram below defines a partial ordering on the set {1,3,5,6}. Give the set of ordered pairs corresponding to this relation.

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(Enter your answers as a comma-separated list of ordered pairs.) My understanding is that in this diagram, every element is not connected to itself, and 3 is only connected to 5, 6, and 1. I'm not sure why the answer isn't (3,5),(3,6),(3,1) Hasse diagram

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Assuming a below b means a < b,
the order would be {(1,3), (3,5), (3.6)}
with six more ordered pairs to assure
reflectivity and transitivity.