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: W_1(a_12) <-> q_3. ~T(a_12). q_3 <-> u. forall x: W_1(x) <-> T(x).
W_1(a_12) -> q_3 can be inferred via the biconditional elimination rule. q_3 -> u can be inferred via the biconditional elimination rule. q_3 -> W_1(a_12) can be inferred via the biconditional elimination rule. u -> q_3 can be inferred via the biconditional elimination rule. forall x: W_1(x) -> T(x) can be inferred via the universal biconditional elimination rule. forall x: T(x) -> W_1(x) can be inferred via the universal biconditional elimination rule.