FILE - In this March 18, 2014 file photo, author and co-executive producer George R. R. Martin attends the "Game of Thrones" fourth season premiere in New York. HBO's "Game of Thrones" is in its home stretch. But the game isn't over for its creator, Martin, who is in the thick of planning as many as five new "Game of Thrones"-related series for the network. Posting on his website, Martin specified that each concept under development is for a prequel, not a sequel. (Photo by Evan Agostini/Invision/AP, File)
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