Consider the following premises. forall x_28: R_28(x_28) -> S_28(x_28). R_28(a_28). t <-> w. s -> w. ~t. Can we infer S_28(a_28) and ~s from them?
 From forall x_28: R_28(x_28) -> S_28(x_28) we can infer R_28(a_28) -> S_28(a_28). From t <-> w, ~t we can infer ~w. From R_28(a_28) -> S_28(a_28), R_28(a_28) we can infer S_28(a_28). From s -> w, ~w we can infer ~s. Finally, from S_28(a_28), ~s we can infer S_28(a_28) and ~s. Therefore, the answer is yes.