What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_7, if x_7 were an artist, then x_7 is a cashier. There is at least one x_7 for which if x_7 climbs a mountain, then x_7 is not a cashier. For all x_7, x_7 is an artist and x_7 is poor.
For all x_7, x_7 is an artist can be inferred via the universal simplification rule. For all x_7, x_7 is poor can be inferred via the universal simplification rule.