With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The brown bear is not a mammal.
text_B: An assault rifle is a rifle that uses an intermediate cartridge , has the capacity to switch between semiautomatic / fully automatic fire and a detachable magazine .. assault rifle. assault rifle. rifle. rifle. intermediate cartridge. intermediate cartridge. semiautomatic. Semi-automatic rifle. fully automatic fire. fully automatic fire. detachable magazine. Magazine ( firearms ). Assault rifles are currently the standard service rifles in most modern armies .. By strict definition , a firearm must have the following characteristics to be considered an assault rifle  :. assault rifle. assault rifle. rifle. rifle. It must be an individual weapon ;. It must be capable of selective fire , which means it has the capacity to switch between semiautomatic and burst / fully automatic fire ;. semiautomatic. Semi-automatic rifle. fully automatic fire. fully automatic fire. selective fire. selective fire. burst. Burst mode ( weapon ). It must have an intermediate-power cartridge  : more power than a pistol but less than a standard rifle or battle rifle ;. rifle. rifle. pistol. pistol. battle rifle. battle rifle. Its ammunition must be supplied from a detachable box magazine ;. ammunition. ammunition. And it should have an effective range of at least 300 m.
not_related.