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_15. ~q_15. t or q.
t -> q_15 can be inferred via the biconditional elimination rule. q_15 -> t can be inferred via the biconditional elimination rule. ~t can be inferred via the biconditional elimination rule.