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: forall y: W_3(y) or T(y). forall y: W_3(y) -> W(y). exists y: W(y) -> W_3(y). forall y: T(y) -> W(y).
exists y: T(y) -> W_3(y) can be inferred via the existential transitivity rule. forall y: W(y) can be inferred via the universal disjunction elimination rule. exists y: W(y) <-> W_3(y) can be inferred via the existential biconditional introduction rule. exists y: W_3(y) <-> W(y) can be inferred via the existential biconditional introduction rule.