With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: ( This is a largely Sunni Arab clan , and some Sunni observers have accused Shiite elements in the government of being behind the assassination ; it is more likely the work of Sunni Arab guerrillas punishing the Batawi leaders for cooperating with the Dec. 15 elections . )
text_B: The cooperating happened
entailed.