At: formula or left sat 1 1 20
1. concl: Formula List
2. M: Formula List
3. N: Formula List
4. q: Formula
5. r: Formula
6. a: Assignment
7. 
F
concl.a |= F
a |
q 
FM.a | F FN.a | F Fconcl.a |= F
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Trivial
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