What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~r_1. R_12(a_12) -> r_1. forall x_12: R_12(x_12) <-> S_12(x_12).
~R_12(a_12). forall x_12: R_12(x_12) -> S_12(x_12). forall x_12: S_12(x_12) -> R_12(x_12).