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 Charles were poor, then it is snowing. If Charles were poor, then it is snowing. If it is cloudy, then Charles is poor. If it snows, then it is cloudy.
If Charles were poor, then it is cloudy can be inferred via the transitivity rule. If Charles were poor, then it is cloudy can be inferred via the transitivity rule. If it is cloudy, then it is snowing can be inferred via the transitivity rule. If it is cloudy, then it is snowing can be inferred via the transitivity rule. If it snows, then Charles is poor can be inferred via the transitivity rule.