Consider the following premises. Joseph is fast if and only if it is sunny. For all x_10, x_10 is not a sailor or x_10 is an electrician. For all x_10, x_10 is a sailor or x_10 is fast. If Joseph were an electrician, then it is sunny. Can we infer the following from them? It is not sunny.
 From the fact that for all x_10, x_10 is a sailor or x_10 is fast, and that for all x_10, x_10 is not a sailor or x_10 is an electrician we can infer that for all x_10, x_10 is fast or x_10 is an electrician. From the fact that for all x_10, x_10 is fast or x_10 is an electrician we can infer that Joseph is fast or Joseph is an electrician. From the fact that Joseph is fast if and only if it is sunny we can infer that if Joseph were fast, then it is sunny. Finally, from the fact that if Joseph were fast, then it is sunny, that if Joseph were an electrician, then it is sunny, and that Joseph is fast or Joseph is an electrician we can infer that it is sunny, which contradicts that It is not sunny. Therefore, the answer is no.