With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Travis Barker frequently collaborated with photographers
text_B: The 1975 Pan American Games , officially known as the VII Pan American Games , were a continental multi-sport event held in Mexico City , Mexico , from October 12 to October 26 , 1975 .. 1975 Pan American Games. 1975 Pan American Games. multi-sport event. multi-sport event. Mexico City. Mexico City. Mexico. Mexico. At the Games , 3,146 athletes selected from 33 National Olympic Committees -LRB- NOCs -RRB- participated in events in 19 sports .. Twenty-three nations earned medals during the competition , and nine won at least one gold medal .
not_related.