With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: The name Pu'er dates back to 1729, but was changed to Simao () in 1950 after the Communist Revolution.
text_B: The name Pu'er dates back to 1720, but was changed to Simao () in 1950 after the Communist Revolution.
contradiction.