Consider the following premises. It is not sunny. It is sunny if and only if it is windy. If Karen doesn't make tea, then Robert is playing squash. It is windy if and only if Karen is making tea. Can we infer the following from them? Robert is playing squash.
 From the fact that it is sunny if and only if it is windy, and that it is not sunny we can infer that it is not windy. From the fact that it is windy if and only if Karen is making tea, and that it is not windy we can infer that Karen is not making tea. Finally, from the fact that if Karen doesn't make tea, then Robert is playing squash, and that Karen is not making tea we can infer that Robert is playing squash. Therefore, the answer is yes.