With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Vlad the Impaler's mother and brother were murdered.
text_B: The AWK Programming Language is a well-known 1988 book written by Alfred V. Aho , Brian W. Kernighan , and Peter J. Weinberger and published by Addison-Wesley .. Alfred V. Aho. Alfred V. Aho. Brian W. Kernighan. Brian W. Kernighan. Peter J. Weinberger. Peter J. Weinberger. Addison-Wesley. Addison-Wesley. AWK. AWK. The book describes the AWK programming language and is the de facto standard for the language , written by its inventors .. AWK. AWK. de facto. de facto. W. Richard Stevens , author of several UNIX books including Advanced Programming in the Unix Environment , cites the book as one of his favorite technical books .. W. Richard Stevens. W. Richard Stevens. Advanced Programming in the Unix Environment. Advanced Programming in the Unix Environment. The book is translated to several languages and is cited by many technical papers in the ACM journals .
not_related.