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: T_3(d_2) <-> w_3. S_13(d_2) <-> w_3. forall x_13: T_3(x_13) or S_13(x_13).
T_3(d_2) -> w_3 can be inferred via the biconditional elimination rule. S_13(d_2) -> w_3 can be inferred via the biconditional elimination rule. w_3 -> T_3(d_2) can be inferred via the biconditional elimination rule. w_3 -> S_13(d_2) can be inferred via the biconditional elimination rule.