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who wrote season 7 of game of thrones
Game of Thrones used seven writers in six seasons. Series creators David Benioff and D. B. Weiss, the showrunners, write most of the episodes each season.

Question: is the storyline of season 7 from the book series
Self-contained rewrite: is the storyline of season 7 of game of thrones from the a song of fire and ice series