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 <-> u_3. p_2 -> u_3. ~s.
s -> u_3 can be inferred via the biconditional elimination rule. u_3 -> s can be inferred via the biconditional elimination rule. ~u_3 can be inferred via the biconditional elimination rule.