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_13. ~q_13. p_8 <-> s_1. ~p_8 -> t.
s_1 -> q_13 can be inferred via the biconditional elimination rule. p_8 -> s_1 can be inferred via the biconditional elimination rule. q_13 -> s_1 can be inferred via the biconditional elimination rule. s_1 -> p_8 can be inferred via the biconditional elimination rule. ~s_1 can be inferred via the biconditional elimination rule.