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

r.N),concl >
9. a |
< r.(M @ N),concl >
a |= < r.(M @ N),concl >
a |
< r.(M @ N),concl >
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THEN
Trivial
Generated subgoals:None
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