Because of the small 3bet size I think 22/55 are likely enough. It does depend how crazy UTG is, if you reckon he shoves over the 3bet alot then maybe 22/55 are very unlikely.

Postflop this is bluff or monster, I doubt he turns KQ or something into air and I just think betting into that many people screams so much strength that he won't bluff you too much.

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