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: There is at least one x_12 for which if x_12 plays squash, then x_12 is running. For all x_12, if x_12 goes running, then x_12 is drinking water. For all x_12, if x_12 climbs a mountain, then x_12 is playing squash. For all x_12, x_12 will climb a mountain and x_12 will drive a car.
There is at least one x_12 for which if x_12 plays squash, then x_12 is drinking water can be inferred via the existential transitivity rule. There is at least one x_12 for which if x_12 climbs a mountain, then x_12 is running can be inferred via the existential transitivity rule. For all x_12, x_12 will climb a mountain can be inferred via the universal simplification rule. For all x_12, x_12 will drive a car can be inferred via the universal simplification rule.