What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x_8: Q(x_8) or S_8(x_8). Q(c) -> r. S_8(c) <-> r.
S_8(c) -> r can be inferred via the biconditional elimination rule. r -> S_8(c) can be inferred via the biconditional elimination rule.