Question 957000
<pre>
1. ~(R & M) --> (L & ~N)
2. N
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3. N v ~L           2    Addition
4. ~(N & L)         3    De Morgan's Law
5. ~(L & N)         4    Commutation
6. ~~(R & M)        1,5  Modus Tollens
7. R & M            6    Double Negation
</pre>

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