With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: His burial chamber was found in the Valley of the Kings in the Theban Necropolis in 1922, but was not opened until a year later.
text_B: His burial chamber was found in the Valley of the Kings in the Theban Necropolis in 1923, but was not opened until a year later.
contradiction.