With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Kirk Douglas was born on July 2nd, 1999.
text_B: The Opetiidae or flat-footed flies are members of a family of flies of the Order Diptera .. Order. order ( biology ). Diptera. Diptera. The family contains only four extant species in one genus , Opetia , and the remaining taxa are known only from fossils .. Opetia. Opetia
not_related.