With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: San Francisco is not the headquarters of multiple Internet-based companies.
text_B: Rohnerville -LRB- formerly , Eel River -RRB- is an unincorporated community in Humboldt County , California .. California. California. Humboldt County. Humboldt County, California. unincorporated community. unincorporated area. It is located 2.25 mi southeast of Fortuna , at an elevation of 197 feet -LRB- 60 m -RRB- .. Fortuna. Fortuna, California. The Eel River post office opened in 1857 and changed its name to Rohnerville in 1874 in honor of the town 's founder , Henry Rohner .. The town is now part of Fortuna , California .. California. California. Fortuna. Fortuna, California
not_related.