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At: formula not falsifiable lemma 1 1 1 1

1. F: Formula
2. a: Assignment
3. (F under a) = 3
4. x:
5. (F under a) = x

x = 3

By: MoveToEnd -3

Generated subgoal:

13. x:
4. (F under a) = x
5. (F under a) = 3
x = 3


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