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: If Patricia climbs a mountain, then James is writing a letter. If Elisabeth works, then James is writing a letter. Susan is an office clerk or Patricia is climbing a mountain. Susan is not an office clerk or Elisabeth is working.
Patricia is climbing a mountain or Elisabeth is working can be inferred via the resolution rule.