With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Extremists have bombed two predominantly pro - British Protestant towns and fired mortar shells at a police station since Sinn Fein was expelled from peace talks on Feb. 20 in punishment for two killings blamed on the Irish Republican Army .
text_B: The bombing did not happen
not-entailed.