What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 will play a game if and only if x_12 is a writer. It is not cold. John is a writer if and only if it is cold.
If John were a writer, then it is cold. If it is cold, then John is a writer. John is not a writer. For all x_12, if x_12 plays a game, then x_12 is a writer. For all x_12, if x_12 were a writer, then x_12 is playing a game.