What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_15: R_15(x_15) -> S_15(x_15). S_15(a_15) <-> u_4. p -> R_15(a_15). p or u_4.
S_15(a_15) -> u_4. u_4 -> S_15(a_15).