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. p_3 <-> t. p_3 <-> s. s_4 <-> t.
p_3 -> t can be inferred via the biconditional elimination rule. p_3 -> s can be inferred via the biconditional elimination rule. s_4 -> t can be inferred via the biconditional elimination rule. t -> p_3 can be inferred via the biconditional elimination rule. s -> p_3 can be inferred via the biconditional elimination rule. t -> s_4 can be inferred via the biconditional elimination rule. ~t can be inferred via the biconditional elimination rule.