At: formula or right sound 1 1 1 2 1 1
1. hyp: Formula List
2. M: Formula List
3. N: Formula List
4. q: Formula
5. r: Formula
6. a: Assignment
7. a |= < hyp,M @ (q

r.N) >
8. a |= < hyp,[q; r/ M @ N] >
a |= < hyp,[q; r/ M @ N] >
a |
< hyp,[q; r/ M @ N] >
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Trivial
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