With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: San Francisco is in Northern Colorado.
text_B: Wolfgang Spate -LRB- 8 September 1911 -- 30 April 1997 -RRB- was a German Luftwaffe fighter pilot during World War II .. World War II. World War II. Luftwaffe. Luftwaffe. He was a recipient of the Knight 's Cross of the Iron Cross with Oak Leaves .. For fighter pilots it was a quantifiable measure of skill and combat success .. He is attributed by some , for an early , 1938 version of the speed to fly theory , usually attributed to Paul MacCready .. speed to fly. speed to fly. Paul MacCready. Paul MacCready. Already a talented glider pilot before the war , he went on to become one of the Luftwaffe 's foremost test pilots .. Luftwaffe. Luftwaffe
not_related.