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: For all x_13, x_13 is an artist. For all x_13, x_13 is poor or x_13 is not a police officer. For all x_13, if x_13 were an artist, then x_13 is poor. For all x_13, if x_13 plays a game, then x_13 is a police officer. There is at least one x_13 for which if x_13 were a taxi driver, then x_13 is playing a game.
For all x_13, x_13 is poor can be inferred via the universal modus ponens rule. There is at least one x_13 for which if x_13 were a taxi driver, then x_13 is a police officer can be inferred via the existential transitivity rule. For all x_13, if x_13 were a police officer, then x_13 is poor can be inferred via the universal rewriting rule.