Instructions: for 11-20, Use Indirect Truth Tables to Determine, for Each

Essay

Instructions: For 11-20, use indirect truth tables to determine, for each given set of propositions, whether it is consistent. If the set is consistent, provide a consistent valuation.
-P ⊃ Q
R ⊃ Q
∼S ⊃ (P $\lor$ R)
(Q • S) ⊃ T
∼(U ⊃ T)
∼W ≡ S