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At: formula not left falsifiable 1 2 1 1 1
1. concl: Formula List
2. M: Formula List
3. N: Formula List
4. f2: Formula
5. a: Assignment
6. FM.a |= F
7. a |= f2
8. FN.a |= F
9. Fconcl.a | F

a | f2
By: BackThru Thm* F:Formula, a:Assignment. a |= F a | F
Generated subgoals:

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