With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: George Tuska was a storybook artist.
text_B: Robert Scott Jackson -LRB- born March 5 , 1957 -RRB- is an American former competition swimmer who represented the United States at the 1976 Summer Olympics in Montreal , Quebec .. swimmer. swimming ( sport ). 1976 Summer Olympics. 1976 Summer Olympics. He placed sixth in the final of the men 's 100-meter backstroke with a time of 57.69 seconds .. Two years later he won the gold medal in the same event at the 1978 World Aquatics Championships in Berlin , Germany .. 1978 World Aquatics Championships. 1978 World Aquatics Championships
not_related.