What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? p_11 <-> S_20(a_20). t -> R_4(a_20). forall x_20: R_4(x_20) -> S_20(x_20). p_11 -> t.
p_11 -> R_4(a_20). p_11 -> S_20(a_20). S_20(a_20) -> p_11.