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. t_4 -> q_4. q_4 <-> s. p -> t_4.
p -> q_4 can be inferred via the transitivity rule. q_4 -> s can be inferred via the biconditional elimination rule. s -> q_4 can be inferred via the biconditional elimination rule. ~q_4 can be inferred via the biconditional elimination rule.