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 it is cold, then Mary is an artist. If Robert were a carpenter, then it is cold. It is raining or it is overcast. If it rains, then Robert is a carpenter. If it is overcast, then it is cold.
If Robert were a carpenter, then Mary is an artist can be inferred via the transitivity rule. If it rains, then it is cold can be inferred via the transitivity rule. If it is overcast, then Mary is an artist can be inferred via the transitivity rule.