With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mirka Federer is Slovak-born and she is a tennis player.
text_B: Tajikistan competed at the 2004 Summer Olympics in Athens , Greece , from 13 to 29 August 2004 .. Athens. Athens. Tajikistan. Tajikistan. 2004 Summer Olympics. 2004 Summer Olympics. Greece. Greece
not_related.