1899
Muhammad Ali 's phrasing to the press in the early part of his career was born of listening to black radio of the 1950 s , which was often white radio announcers speaking slang " jive " and imitating black announcers while withholding the fact on air of their backgrounds .
 person: Muhammad Ali
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Text: {0} 
Answer:
 person: Muhammad Ali