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_3. s_3 <-> q. p_1 -> q.
s_3 -> q can be inferred via the biconditional elimination rule. q -> s_3 can be inferred via the biconditional elimination rule. ~q can be inferred via the biconditional elimination rule.