With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Douglas Aircraft Company was founded in 1921.
text_B: Herbert II may refer to  :. Herbert II , Count of Vermandois -LRB- 884 -- 943 -RRB-. Herbert II , Count of Maine -LRB- died in 1062 -RRB-
not_related.