Among the statements:
(S1) $\quad((p \vee q) \Rightarrow r) \Leftrightarrow(p \Rightarrow r)$
$(S 2) \quad((p \vee q) \Rightarrow r) \Leftrightarrow((p \Rightarrow r) \vee(q \Rightarrow r))$
(1) Only (S1) is a tautology
(2) Neither (S1) nor (S2) is a tautology
(3) Only (S2) is a tautology
(4) Both (S1) and (S2) are tautologies
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