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For ease of reference:

Table.  Propositional Forms on Two Variables
o------o--------o---------o----------o------------------o----------o
|      |      p | 1 1 0 0 |          |                  |          |
|      |      q | 1 0 1 0 |          |                  |          |
o------o--------o---------o----------o------------------o----------o
|      |      