With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Yemen is the ancestral homeland of al-Qaida leader Osama bin Laden , and the terrorist group has carried out several attacks in the country , including the 2000 bombing of a U.S. warship in Aden that killed 17 American sailors .
text_B: 2000 is a calendar year
entailed.