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_4, if x_4 were a musician, then x_4 is happy. For all x_4, x_4 will go running. For all x_4, x_4 is happy or x_4 will not go running.
For all x_4, if x_4 goes running, then x_4 is happy can be inferred via the universal rewriting rule.