With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: In the decade of the nineteen - eighties , my father , then vice - president of the United States of America , sought to work with the good offices of the President of the Republic of Iraq to regain lost oil revenue sources in the neighboring Islamic republic of Iran .
text_B: The working did not happen
entailed.