Consider the following premises. It is sunny if and only if Patricia is a carpenter. Richard is a scientist if and only if it is sunny. For all x_15, x_15 is not a carpenter. Can we infer the following from them? Richard is a scientist.
 From the fact that for all x_15, x_15 is not a carpenter we can infer that Patricia is not a carpenter. From the fact that it is sunny if and only if Patricia is a carpenter, and that Patricia is not a carpenter we can infer that it is not sunny. From the fact that Richard is a scientist if and only if it is sunny we can infer that if Richard were a scientist, then it is sunny. Finally, from the fact that if Richard were a scientist, then it is sunny, and that it is not sunny we can infer that Richard is not a scientist, which contradicts that Richard is a scientist. Therefore, the answer is no.