With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Leonardo da Vinci built a parachute, helicopter, and tank.
text_B: The Heinrich Boll Foundation -LRB- hbf ; German  : Heinrich-Boll-Stiftung e.V. , hbs -RRB- is a German , legally independent political foundation .. Heinrich Boll. Heinrich Boll. Affiliated with the German Green Party , it was founded in 1997 when three predecessors merged .. German Green Party. Alliance '90 / The Greens. The foundation was named after German writer Heinrich Boll -LRB- 1917 -- 1985 -RRB- .. Heinrich Boll. Heinrich Boll
not_related.