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 James were a mechanic, then Richard is climbing a mountain. If Richard climbs a mountain, then James is a taxi driver. If James were a taxi driver, then James is a mechanic.
If James were a mechanic, then James is a taxi driver can be inferred via the transitivity rule. If Richard climbs a mountain, then James is a mechanic can be inferred via the transitivity rule. If James were a taxi driver, then Richard is climbing a mountain can be inferred via the transitivity rule.