What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_15, if x_15 were a cashier, then x_15 is climbing a mountain. There is at least one x_15 for which if x_15 were a mechanic, then x_15 is climbing a mountain. For all x_15, x_15 is not fast or x_15 is a cashier. For all x_15, x_15 is fast or x_15 will drink water. For all x_15, x_15 is rich if and only if x_15 will drink water. For all x_15, if x_15 were rich, then x_15 is a mechanic.
There is at least one x_15 for which if x_15 were rich, then x_15 is climbing a mountain. For all x_15, x_15 will drink water or x_15 is a cashier. For all x_15, if x_15 were rich, then x_15 is drinking water. For all x_15, if x_15 drinks water, then x_15 is rich.