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: s <-> R_2(h). q. forall y: ~R_2(y).
s -> R_2(h) can be inferred via the biconditional elimination rule. R_2(h) -> s can be inferred via the biconditional elimination rule.