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Rules of Inference, Logic and Symbology

Designate each simple statement with a letter. Then write down the compound statements using the following rules(modus ponens, modus tollens, hypothetical syllogism, disjunctive syllogism, addition, simplification, or resolution), arrive at the conclusion. I've done all but the latter.

If you send an email then I will write the program
If you do not send an email then I will sleep
If I go to sleep then I will be refreshed
__________________________________
If I do not write the program then I will be refreshed.

p -> q
~q -> r
r -> s
_______
~q -> s

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