With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: The Siboney were the first to inhabit the islands of Antigua and Barbuda in 2400 B.C . , but Arawak Indians populated the islands when COLUMBUS landed on his second voyage in 1493 .
text_B: Siboney is a calendar year
not-entailed.