Answer the following question: Information: - A role-playing game system is a set of game mechanics used in a role-playing game (RPG) to determine the outcome of a character's in-game actions. - Steve Jackson Games (SJGames) is a game company, founded in 1980 by Steve Jackson, that creates and publishes role-playing, board, and card games, and the gaming magazine "Pyramid". - GURPS Time Travel is a sourcebook for GURPS . It was published in 1991 . - The Generic Universal RolePlaying System, or GURPS, is a tabletop role-playing game system designed to allow for play in any game setting. It was created by Steve Jackson Games and first published in 1986 at a time when most such systems were story- or genre-specific. - The term sourcebook (or source book) is used to describe many different kinds of books such as collections of core articles (i.e., anthology), bibliographies, biographies, printed archival sources, directories and so on. There seems to be no consensus in the application of this term. Given the information, choose the subject and object entities that have the relation of 'instance of'.
Answer:
gurps time travel , game