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_7, if x_7 goes running, then x_7 is happy. For all x_7, x_7 will go running or x_7 is not happy. There is at least one x_7 for which if x_7 goes running, then x_7 is sleeping.
For all x_7, if x_7 were happy, then x_7 is running can be inferred via the universal rewriting rule.