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: There is at least one x for which x will sleep or x is not a mechanic. For all x, x is a mechanic or x will not sleep.
For all x, if x sleeps, then x is a mechanic can be inferred via the universal rewriting rule. There is at least one x for which if x were a mechanic, then x is sleeping can be inferred via the existential rewriting rule.