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: ~s_4. t <-> p. t -> w. w -> r_11. s_4 <-> r_11.
t -> r_11 can be inferred via the transitivity rule. t -> p can be inferred via the biconditional elimination rule. s_4 -> r_11 can be inferred via the biconditional elimination rule. p -> t can be inferred via the biconditional elimination rule. r_11 -> s_4 can be inferred via the biconditional elimination rule. ~r_11 can be inferred via the biconditional elimination rule.