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: For all y_2, if y_2 listens to a song, then y_2 is a sailor. For all y_2, if y_2 listens to a song, then y_2 is a sailor. For all y_2, y_2 will listen to a song if and only if y_2 is a sailor.
For all y_2, if y_2 listens to a song, then y_2 is a sailor can be inferred via the universal biconditional elimination rule. For all y_2, if y_2 were a sailor, then y_2 is listening to a song can be inferred via the universal biconditional elimination rule.