With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: His successor, al-Muhtadi, also tried to reaffirm the Caliph's authority, but he too was killed in June 870.
text_B: His successor, al-Muhtadi, also tried to reaffirm the Caliph's authority, but he too was killed in June 871.
contradiction.