Let p, q, r, and s represent simple English sentences. Which of the following best represents? p and q implies r, but not r implies s

a. ((p . q) ?> r) . (?r ?> s)
b. ((p . q) ?> r) v (?r ?> s)
c. (p . q) ?> r) . (?r ?> s)
d. (p . ((q ?> r) . (?r ?> s)


a

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