  | not p            | ~p       |
|      |        |         |          |                  |          |
| f_4  | f_0100 | 0 1 0 0 |   p (q)  | p and not q      |  p &amp; ~q  |
|      |        |         |          |                  |          |
| f_5  | f_0101 | 0 1 0 1 |     (q)  | not q            |      ~q  |
|      |        |         |          |                  |          |
| f_6  | f_0110 | 0 1 1 0 |  (p, q)  | p not equal to q |  p +  q  |
|      |        |         |          |                  |   