Consider the following premises. Joseph is not taking a plane if and only if it is cold. For all x_21, x_21 will take a plane if and only if x_21 will sleep. Karen is not a musician. Joseph is sleeping if and only if Karen is a musician. Can we infer the following from them? It is not cold.
 From the fact that for all x_21, x_21 will take a plane if and only if x_21 will sleep we can infer that Joseph is taking a plane if and only if Joseph is sleeping. From the fact that Joseph is sleeping if and only if Karen is a musician, and that Karen is not a musician we can infer that Joseph is not sleeping. From the fact that Joseph is taking a plane if and only if Joseph is sleeping, and that Joseph is not sleeping we can infer that Joseph is not taking a plane. From the fact that Joseph is not taking a plane if and only if it is cold we can infer that if Joseph doesn't take a plane, then it is cold. Finally, from the fact that if Joseph doesn't take a plane, then it is cold, and that Joseph is not taking a plane we can infer that it is cold, which contradicts that It is not cold. Therefore, the answer is no.