With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: 1635 was when Boston Latin School was established.
text_B: Bruckenberg is a mountain of Saxony , southeastern Germany .. Saxony. Saxony. Germany. Germany. Category  : Mountains of Saxony. Saxony. Saxony. Category  : Mountains of the Ore Mountains
not_related.