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: q_15 <-> t. t -> q. Q(c_2) -> t. forall y: Q(y).
Q(c_2) -> q can be inferred via the transitivity rule. q_15 -> t can be inferred via the biconditional elimination rule. t -> q_15 can be inferred via the biconditional elimination rule.