Consider the following premises. For all x_12, x_12 will climb a mountain or x_12 will not listen to a song. There is at least one x_12 for which x_12 will sleep if and only if x_12 will climb a mountain. For all x_12, if x_12 were a doctor, then x_12 is listening to a song. Can we infer the following from them? If we can, name the inference rule being used: For all x_12, the fact that x_12 were a doctor does not imply that x_12 is sleeping.
That contradicts the premises. Therefore the answer is no.