What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, if x_6 were a mechanic, then x_6 is playing squash. For all x_6, x_6 will play squash or x_6 will not take a plane. For all x_6, x_6 is an astronaut or x_6 is a mechanic. For all x_6, x_6 is not an astronaut or x_6 will take a plane.
For all x_6, x_6 is a mechanic or x_6 will take a plane. For all x_6, if x_6 takes a plane, then x_6 is playing squash.