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 -> S_2(a_12). forall x_12: S_2(x_12) -> S_12(x_12). S_12(a_12) -> s_1.
S_12(a_12) -> S_2(a_12) can be inferred via the transitivity rule.