Consider the following premises. For all x_17, x_17 is a mechanic or x_17 will cook. It is sunny if and only if Thomas is taking a plane. If Thomas were a mechanic, then Thomas is taking a plane. If Thomas cooks, then Thomas is taking a plane. Can we infer the following from them? It is not sunny.
 From the fact that for all x_17, x_17 is a mechanic or x_17 will cook we can infer that Thomas is a mechanic or Thomas is cooking. From the fact that if Thomas were a mechanic, then Thomas is taking a plane, that if Thomas cooks, then Thomas is taking a plane, and that Thomas is a mechanic or Thomas is cooking we can infer that Thomas is taking a plane. From the fact that it is sunny if and only if Thomas is taking a plane we can infer that if Thomas takes a plane, then it is sunny. Finally, from the fact that if Thomas takes a plane, then it is sunny, and that Thomas is taking a plane we can infer that it is sunny, which contradicts that It is not sunny. Therefore, the answer is no.