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: p_1 -> s. w_2 -> q. q -> p_1. s -> w_2.
p_1 -> w_2 can be inferred via the transitivity rule. w_2 -> p_1 can be inferred via the transitivity rule. q -> s can be inferred via the transitivity rule. s -> q can be inferred via the transitivity rule.