Consider the following premises. For all x_12, x_12 will drink water if and only if x_12 is bored. There is at least one x_12 for which x_12 is not a musician. For all x_12, x_12 is bored if and only if x_12 is a musician. Can we infer the following from them? If we can, name the inference rule being used: There is at least one x_12 for which x_12 is not a musician.
That is one of the premises. Therefore, the answer is yes.