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 y for which y will climb a mountain or y is a nurse. For all y, y will not climb a mountain or y will take a plane.
There is at least one y for which y is a nurse or y will take a plane can be inferred via the existential resolution rule.