Use a truth table to determine which of the following are always true.
a. (p ⇒ q) ⇒ (q ⇒ p)
b. p ⇒ p
c. [p ˄ (p ⇒ q)] ⇒ q
d. (p ˅ q) ⇒ (p ˄ q)
e. (p ˄ q) ⇒ p?
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