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: exists x_19: P_15(x_19) -> T(x_19). forall x_19: P_19(x_19) or W(x_19). forall x_19: Q_15(x_19) -> T(x_19). forall x_19: W(x_19) -> R(x_19). forall x_19: ~P_19(x_19) or W_2(x_19). forall x_19: P_15(x_19) or Q_15(x_19). forall x_19: W_2(x_19) <-> R(x_19).
forall x_19: W(x_19) or W_2(x_19) can be inferred via the universal resolution rule. exists x_19: T(x_19) can be inferred via the existential disjunction elimination rule. forall x_19: W_2(x_19) -> R(x_19) can be inferred via the universal biconditional elimination rule. forall x_19: R(x_19) -> W_2(x_19) can be inferred via the universal biconditional elimination rule.