What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? William is rich or Richard is not drinking water. For all x_11, if x_11 were rich, then x_11 is working. For all x_11, if x_11 works, then x_11 is playing tennis.
If Richard drinks water, then William is rich. For all x_11, if x_11 were rich, then x_11 is playing tennis.