With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: He was to have been the sixth person to land and walk on the Moon, but the Apollo 13 mission was aborted before lunar landing.
text_B: He was to have been the sixth person to land and walk on the Moon, but the Apollo 14 mission was aborted before lunar landing.
contradiction.