With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The inspiration for Sherlock (TV series) is stories by a British author.
text_B: Morpho polyphemus , the white morpho or Polyphemus white morpho , is a white butterfly of Mexico and Central America , ranging as far south as Costa Rica .. Morpho. Morpho. butterfly. butterfly. Mexico. Mexico. Central America. Central America. Costa Rica. Costa Rica. morpho. morpho. As suggested by its name , this is one of the relatively few morphos that is white rather than blue .. Some authorities include M. luna , which is also white , as a subspecies of M. polyphemus .. M. luna. Morpho luna. subspecies. subspecies
not_related.