With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Lockheed Martin F-22 Raptor is considered critical by the Russians.
text_B: Azodicarbonamide , or azo -LRB- bis -RRB- formamide , is a chemical compound with the molecular formula C2H4O2N4 .. It is a yellow to orange-red , odorless , crystalline powder .
not_related.