What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Patricia is a writer if and only if it is late. It is late if and only if Thomas is playing a game. It is not snowing. It is snowing if and only if Thomas is playing a game.
If Patricia were a writer, then it is late. If it is late, then Thomas is playing a game. If it snows, then Thomas is playing a game. If it is late, then Patricia is a writer. If Thomas plays a game, then it is late. If Thomas plays a game, then it is snowing. Thomas is not playing a game.