With no explanation, label text_A→text_B with either "entailment", "neutral" or "contradiction".
text_A: Tillis challenged for the WBA world heavyweight title in 1981, but was defeated by fifteen round unanimous decision to Mike Weaver.
text_B: Tillis challenged for the WBA world heavyweight title in 1982, but was defeated by fifteen round unanimous decision to Mike Weaver.
contradiction.