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_1 <-> q_8. ~p. p <-> q_8.
s_1 -> q_8 can be inferred via the biconditional elimination rule. p -> q_8 can be inferred via the biconditional elimination rule. q_8 -> s_1 can be inferred via the biconditional elimination rule. q_8 -> p can be inferred via the biconditional elimination rule. ~q_8 can be inferred via the biconditional elimination rule.