What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: ~p_1. W(a_7) <-> p_1. forall x_7: W(x_7) <-> S_7(x_7).
W(a_7) -> p_1 can be inferred via the biconditional elimination rule. p_1 -> W(a_7) can be inferred via the biconditional elimination rule. ~W(a_7) can be inferred via the biconditional elimination rule. forall x_7: W(x_7) -> S_7(x_7) can be inferred via the universal biconditional elimination rule. forall x_7: S_7(x_7) -> W(x_7) can be inferred via the universal biconditional elimination rule.