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At: auto2 lemma 0 1 1

1. T: Type
2. P: TProp
3. x:T. Dec(P(x))
4. Dec(x:T. P(x))

Dec(x:T. P(x))

By:
Unfold `decidable` 0
THEN
Unfold `decidable` 4


Generated subgoal:

14. (x:T. P(x)) (x:T. P(x))
(x:T. P(x)) (x:T. P(x))


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