Construct a Complete Truth Table for Each of the Following $\lor$

construct a complete truth table for each of the following propositions. Then, using the truth table, classify each proposition as a tautology, a contingency, or a contradiction.
Justify your answers by appeal to the meanings of those terms.
-[(Q ⊃ R) ⊃ (R ⊃ S)] ≡ ∼(∼Q $\lor$ S)