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_3 <-> u_1. u_3 <-> p. u_1 <-> u_3. ~p.
q_3 -> u_1 can be inferred via the biconditional elimination rule. u_3 -> p can be inferred via the biconditional elimination rule. u_1 -> u_3 can be inferred via the biconditional elimination rule. u_1 -> q_3 can be inferred via the biconditional elimination rule. p -> u_3 can be inferred via the biconditional elimination rule. u_3 -> u_1 can be inferred via the biconditional elimination rule. ~u_3 can be inferred via the biconditional elimination rule.