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_9, if x_9 drinks water, then x_9 is climbing a mountain. For all x_9, x_9 will drink water or x_9 is an artist. For all x_9, x_9 will play tennis and x_9 is a lawyer. For all x_9, if x_9 were an artist, then x_9 is climbing a mountain.
For all x_9, x_9 will play tennis can be inferred via the universal simplification rule. For all x_9, x_9 is a lawyer can be inferred via the universal simplification rule. For all x_9, x_9 will climb a mountain can be inferred via the universal disjunction elimination rule.