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: R_8(a_8) -> p. S_8(a_8) <-> p. forall x_8: R_8(x_8) or S_8(x_8).
S_8(a_8) -> p can be inferred via the biconditional elimination rule. p -> S_8(a_8) can be inferred via the biconditional elimination rule.