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 y, if y climbs a mountain, then y is driving a car. For all y, y will take a plane. For all y, if y takes a plane, then y is climbing a mountain.
For all y, y will climb a mountain can be inferred via the universal modus ponens rule. For all y, if y takes a plane, then y is driving a car can be inferred via the universal transitivity rule.