What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_21, x_21 will make tea if and only if x_21 will take a plane. For all x_21, if x_21 were a police officer, then x_21 is making tea. For all x_21, x_21 is a police officer or x_21 will work. For all x_21, if x_21 works, then x_21 is making tea.
For all x_21, x_21 will make tea. For all x_21, if x_21 makes tea, then x_21 is taking a plane. For all x_21, if x_21 takes a plane, then x_21 is making tea.