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: ~t. q_5 -> p_1. t <-> q_5. p_1 -> q_5.
q_5 <-> p_1 can be inferred via the biconditional introduction rule. p_1 <-> q_5 can be inferred via the biconditional introduction rule. t -> q_5 can be inferred via the biconditional elimination rule. q_5 -> t can be inferred via the biconditional elimination rule. ~q_5 can be inferred via the biconditional elimination rule.