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At: formula or left sound

concl,M,N:Formula List, q,r:Formula. |= < q.(M @ N),concl > |= < r.(M @ N),concl > |= < M @ (qr.N),concl >
By: UnivCD
Generated subgoal:

11. concl: Formula List
2. M: Formula List
3. N: Formula List
4. q: Formula
5. r: Formula
6. |= < q.(M @ N),concl >
7. |= < r.(M @ N),concl >
|= < M @ (qr.N),concl >

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alllistimpliespaircons