With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: In 1980 , two years after independence , Dominica 's fortunes improved when a corrupt and tyrannical administration was replaced by that of Mary Eugenia CHARLES , the first female prime minister in the Caribbean , who remained in office for 15 years .
text_B: 1980 is a calendar year
entailed.