With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: The author of the tune is unknown and it may originate in plainchant, but a 1619 attribution to John Bull is sometimes made.
text_B: The author of the tune is unknown and it may originate in plainchant, but a 1610 attribution to John Bull is sometimes made.
contradiction.