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1. The statement expresses that if P and Q are not both true, then either P and Q are not both false or R is true. 2. The statement expresses that the biconditional of P or Q being true if and only if R is true is equivalent to if P and Q are not both true, then S is true. 3. The statement expresses that if Q is true and either not (Q and T) or (R or P) is true, then Q and not T being the inverse of S is true.