Question 981474
<pre>
1.  ~(~W&D)
2.   A&(P&D)
               /W

3. ~~Wv~D           1, DeMorgan
4. Wv~D             3, double negation
5. (A&P)&D          2, association
6. D&(A&P)          5, commutation
7. D                6, simplification
8. ~~D              7, double negation
9. W              4,8, disjunctive syllogism

Edwin</pre>