Consider the following premises. For all x_16, x_16 is a doctor or x_16 will not play squash. If Robert were a doctor, then it is late. Robert is playing squash. Can we infer the following from them? It is late.
 From the fact that for all x_16, x_16 is a doctor or x_16 will not play squash we can infer that for all x_16, if x_16 plays squash, then x_16 is a doctor. From the fact that for all x_16, if x_16 plays squash, then x_16 is a doctor we can infer that if Robert plays squash, then Robert is a doctor. From the fact that if Robert plays squash, then Robert is a doctor, and that Robert is playing squash we can infer that Robert is a doctor. Finally, from the fact that if Robert were a doctor, then it is late, and that Robert is a doctor we can infer that it is late. Therefore, the answer is yes.