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: There is at least one y for which if y were excited, then y is a sailor. For all y, if y were a sailor, then y is excited.
There is at least one y for which y is excited if and only if y is a sailor can be inferred via the existential biconditional introduction rule. There is at least one y for which y is a sailor if and only if y is excited can be inferred via the existential biconditional introduction rule.