With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: David Schwimmer finished acting in Friends on October 8, 2004.
text_B: Hexaplex nigritus , the Northern Radix or Black-and-White Murex or Black Murex , is a species of sea snail , a marine gastropod mollusk in the family Muricidae , the murex snails or rock snails .. Muricidae. Muricidae. Hexaplex. Hexaplex. species. species. sea snail. sea snail. gastropod. gastropod. mollusk. mollusk. family. family ( biology ). It is commonly known as the black murex shell .
not_related.