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 Robert goes running, then Robert is an artist. Robert is running and it is overcast. If Robert were an artist, then it is cloudy.
If Robert goes running, then it is cloudy can be inferred via the transitivity rule. Robert is running can be inferred via the simplification rule. It is overcast can be inferred via the simplification rule.