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_5, if x_5 writes a letter, then x_5 is playing a game. For all x_5, if x_5 reads a book, then x_5 is writing a letter. For all x_5, x_5 will listen to a song. For all x_5, x_5 is fast or x_5 will read a book. For all x_5, if x_5 were fast, then x_5 is playing a game.
For all x_5, if x_5 reads a book, then x_5 is playing a game can be inferred via the universal transitivity rule.