With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Abraham Lincoln concentrated on certain aspects of the war.
text_B: The red-rimmed melania , scientific name Melanoides tuberculata , is a species of freshwater snail with an operculum , a parthenogenetic , aquatic gastropod mollusk in the family Thiaridae .. Thiaridae. Thiaridae. Melanoides. Melanoides. scientific name. scientific name. freshwater snail. freshwater snail. operculum. Operculum ( gastropod ). parthenogenetic. parthenogenesis. aquatic. aquatic animal. gastropod. gastropod. mollusk. mollusk. The common name comes from the presence of reddish spots on the otherwise greenish-brown shell .. common name. common name. The species name is sometimes spelled Melanoides tuberculatus , but this is incorrect because Melanoides Olivier , 1804 was clearly intended to be feminine because it was combined with the feminine specific epithet fasciolata in the original description .. Melanoides. Melanoides. specific epithet. specific name ( zoology ). This species is native to northern Africa and southern Asia , but it has been accidentally introduced in many other tropical and subtropical areas worldwide .. It has also been accidentally introduced to heated aquaria in colder parts of the world .. aquaria. aquarium
not_related.