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. u and q_5. p <-> q_1.
u can be inferred via the simplification rule. q_5 can be inferred via the simplification rule. p -> q_1 can be inferred via the biconditional elimination rule. q_1 -> p can be inferred via the biconditional elimination rule. ~q_1 can be inferred via the biconditional elimination rule.