With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Antarctica has people who reside in it.
text_B: qtch -LRB- .. qtch -RRB- is a filetype used by QuickTime to store audio or video files streamed from a server on the client 's computer hard drive .. filetype. filetype. QuickTime. QuickTime. store. web cache. streamed. streamed. client. Client ( computing ). The first 16 bytes are  :. <nowiki>. Hex ; ASCII. 00 00 00 50 71 74 63 68 00 00 00 02 00 00 00 02 ; ... Pqtch .... < / nowiki>. This file type seems to have been introduced with QuickTime Player 7.x .. QuickTime. QuickTime. The file is normally stored in any sub-directories of the following location  :
not_related.