What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? u <-> S_12(g_4). u or R_12(g_4). forall x_12: R_12(x_12) <-> S_12(x_12).
R_1(g_4) -> u. u -> S_12(g_4). S_12(g_4) -> u. forall x_12: R_12(x_12) -> S_12(x_12). forall x_12: S_12(x_12) -> R_12(x_12).