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: p_13 <-> t_2. p_13 <-> p_1. t_2 -> ~S(g). forall y: S(y).
p_13 -> t_2 can be inferred via the biconditional elimination rule. p_13 -> p_1 can be inferred via the biconditional elimination rule. t_2 -> p_13 can be inferred via the biconditional elimination rule. p_1 -> p_13 can be inferred via the biconditional elimination rule.