Consider the following premises. For all x_17, x_17 will listen to a song if and only if x_17 will climb a mountain. If Michael were fast, then John is a cashier. For all x_17, x_17 will listen to a song or x_17 is fast. For all x_17, x_17 will not climb a mountain. Can we infer the following from them? John is not a cashier.
 From the fact that for all x_17, x_17 will listen to a song if and only if x_17 will climb a mountain, and that for all x_17, x_17 will not climb a mountain we can infer that for all x_17, x_17 will not listen to a song. From the fact that for all x_17, x_17 will listen to a song or x_17 is fast, and that for all x_17, x_17 will not listen to a song we can infer that for all x_17, x_17 is fast. From the fact that for all x_17, x_17 is fast we can infer that Michael is fast. Finally, from the fact that if Michael were fast, then John is a cashier, and that Michael is fast we can infer that John is a cashier, which contradicts that John is not a cashier. Therefore, the answer is no.