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_16. p_16 <-> s_1. s_1 -> s. p_16 -> s_1.
s -> s_1 can be inferred via the transitivity rule. s_1 -> p_16 can be inferred via the transitivity rule. p_16 -> s can be inferred via the transitivity rule. p_16 -> s_1 can be inferred via the biconditional elimination rule. s_1 -> p_16 can be inferred via the biconditional elimination rule.