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 or w. t <-> q_1. ~t. p -> q_1.
t -> q_1 can be inferred via the biconditional elimination rule. q_1 -> t can be inferred via the biconditional elimination rule. ~q_1 can be inferred via the biconditional elimination rule.