What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_16, if x_16 were a carpenter, then x_16 is taking a plane. For all x_15, x_15 is an office clerk. For all x_16, if x_16 were an office clerk, then x_16 is a carpenter.
For all x_16, if x_16 were an office clerk, then x_16 is taking a plane.