Which of the following statement patterns is a contradiction?
- A$S_3 \equiv (\sim p \wedge q) \wedge (\sim q)$
- B$S_2 \equiv (p \rightarrow q) \vee (p \wedge \sim q)$
- C$S_1 \equiv (\sim p \vee \sim q) \vee (p \vee \sim q)$
- D$S_4 \equiv (\sim p \wedge q) \vee (\sim q)$
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