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 <-> p_1. q_2. p_1 -> ~q_2.
~p_1 can be inferred via the modus tollens rule. s -> p_1 can be inferred via the biconditional elimination rule. p_1 -> s can be inferred via the biconditional elimination rule.