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: ~U(a_17). forall x_17: U(x_17) -> S_17(x_17). q_1 <-> U(a_17). S_17(a_17) -> q_1.
q_1 -> U(a_17) can be inferred via the biconditional elimination rule. U(a_17) -> q_1 can be inferred via the biconditional elimination rule.