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_1, if x_1 goes running, then x_1 is an astronaut. For all x_1, if x_1 drinks water, then x_1 is running. There is at least one x_1 for which if x_1 were an astronaut, then x_1 is drinking water.
For all x_1, if x_1 drinks water, then x_1 is an astronaut can be inferred via the universal transitivity rule. There is at least one x_1 for which if x_1 were an astronaut, then x_1 is running can be inferred via the existential transitivity rule. There is at least one x_1 for which if x_1 goes running, then x_1 is drinking water can be inferred via the existential transitivity rule.