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) -> R(y). exists y: W_3(y) <-> P(y). forall y: R(y) -> W_3(y). forall y: ~P(y).
forall y: W_3(y) <-> R(y) can be inferred via the universal biconditional introduction rule. forall y: R(y) <-> W_3(y) can be inferred via the universal biconditional introduction rule. exists y: W_3(y) -> P(y) can be inferred via the existential biconditional elimination rule. exists y: P(y) -> W_3(y) can be inferred via the existential biconditional elimination rule. exists y: ~W_3(y) can be inferred via the existential biconditional elimination rule.