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: Robert is working. If it is cold, then Robert is not working. If it is cloudy, then it is cold.
It is not cold can be inferred via the modus tollens rule. If it is cloudy, then Robert is not working can be inferred via the transitivity rule.