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At: formula or left sound 1 1 2 1 2 3
1. concl: Formula List
2. M: Formula List
3. N: Formula List
4. q: Formula
5. r: Formula
6. a: Full( < M @ (qr.N),concl > )
7. a |= < r.(M @ N),concl >
8. Fconcl.a |= F

FM.a | F a | q & a | r FN.a | F Fconcl.a |= F
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