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http://en.wikipedia.org/wiki/The_Richard_Pryor_Show

The star of controversial young comic Richard Pryor was very much on the rise, when he was approached by NBC, in 1977, to do a 1-hour special for the network. He had already experienced phenomenal success as a nightclub performer, and had his popularity was soaring, after his performances in the movies 'Silver Streak', and 'Greased Lightning'.

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https://www.kprotector.com/p18/59ece10b4fd2e