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_11 -> t_3. ~w. w <-> q_11. t_3 -> q_11. u_4 -> t_3.
u_4 -> q_11 can be inferred via the transitivity rule. q_11 <-> t_3 can be inferred via the biconditional introduction rule. t_3 <-> q_11 can be inferred via the biconditional introduction rule. w -> q_11 can be inferred via the biconditional elimination rule. q_11 -> w can be inferred via the biconditional elimination rule. ~q_11 can be inferred via the biconditional elimination rule.