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, x_7 will drive a car or x_7 will not sleep. There is at least one x_7 for which x_7 will sleep or x_7 will not write a letter.
For all x_7, if x_7 sleeps, then x_7 is driving a car can be inferred via the universal rewriting rule. There is at least one x_7 for which if x_7 writes a letter, then x_7 is sleeping can be inferred via the existential rewriting rule.