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At: auto2 lemma 1 1 1 2 2 1
1. T: Type
2. P: TProp
3. Q: TProp
4. t:T. P(t) Q(t)

Id o Id = Id & Id o Id = Id
By: Unfold `identity` 0
Generated subgoal:

1 (x.x) o (x.x) = Id & (x.x) o (x.x) = Id

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