Question 1025707
<pre>
1. (AvB) &#8835; C 
2. (CvD) &#8835; (EvF) 
3. A&#9679;~E             / F

4.  A           3, Simplification
5.  AvB         4, Addition
6.  C           1,5 Modus ponens
7.  CvD         6, Addition
8.  EvF         2,7 Modus Ponens
9.  ~E&#9679;A        3, Commutation
10. ~E          9, Simplification   
11. F           8,11, Disjunctive Syllogism 

Edwin</pre>