With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Gregor Clegane is the older brother of The Hound.
text_B: Sandor Clegane , nicknamed The Hound , is a fictional character in the A Song of Ice and Fire series of fantasy novels by American author George R. R. Martin , and its television adaptation Game of Thrones .. A Song of Ice and Fire. A Song of Ice and Fire. Game of Thrones. Game of Thrones. George R. R. Martin. George R. R. Martin. fictional character. fictional character. fantasy. fantasy. Introduced in 1996 's A Game of Thrones , Sandor is the younger brother of Ser Gregor Clegane , from the fictional kingdom of Westeros .. Game of Thrones. Game of Thrones. A Game of Thrones. A Game of Thrones. Gregor Clegane. Gregor Clegane. Westeros. Westeros. He subsequently appeared in Martin 's A Clash of Kings -LRB- 1998 -RRB- , A Storm of Swords -LRB- 2000 -RRB- and A Feast for Crows -LRB- 2005 -RRB- .. A Feast for Crows. A Feast for Crows. A Clash of Kings. A Clash of Kings. A Storm of Swords. A Storm of Swords. Sandor Clegane is portrayed by Rory McCann in the HBO television adaptation .. Rory McCann. Rory McCann. HBO. HBO
related.