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_17, x_17 is not an astronaut. William is an artist or James is an astronaut. William is not an artist or it is snowing.
James is an astronaut or it is snowing can be inferred via the resolution rule. If James were a poet, then William is an artist can be inferred via the rewriting rule.