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, if y takes a plane, then y is making tea. For all y, y will make tea if and only if y will take a plane. For all y, y is a police officer or y will not make tea.
For all y, if y makes tea, then y is a police officer can be inferred via the universal rewriting rule. For all y, if y makes tea, then y is taking a plane can be inferred via the universal biconditional elimination rule. For all y, if y takes a plane, then y is making tea can be inferred via the universal biconditional elimination rule.