With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Marvin heard that when i was a boy of 14 my father was so ignorant i could hardly stand to have the old man around but when i got to be 21 i was astonished at how much the old man had learned in seven years
text_B: Marvin heard a pun
not-entailed.