Construct a truth table for each of these compound propositions.
a) p → (¬q ∨ r)
b) ¬p → (q → r)
c) (p → q) ∨ (¬p → r)
d) (p → q) ∧ (¬p → r)
e) (p ↔ q) ∨ (¬q ↔ r)
f) (¬p ↔¬q) ↔ (q ↔ r)