What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~u_4 or q. forall x_13: Q_13(x_13) -> P_13(x_13). forall x_13: P_13(x_13) -> Q_13(x_13). forall x_13: ~Q_13(x_13). u_4 or P_13(i_4).
P_13(i_4) or q. R_1(i_4) -> u_4. forall x_13: ~P_13(x_13). forall x_13: Q_13(x_13) <-> P_13(x_13). forall x_13: P_13(x_13) <-> Q_13(x_13).