With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Arrow was structured into seasons.
text_B: Season 1880 -- 81 was the sixth season in which Heart of Midlothian competed at a Scottish national level , entering the Scottish Cup for the sixth time .. Heart of Midlothian. Heart of Midlothian F.C.. Scottish Cup. Scottish Cup. Scottish. Scotland
not_related.