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"The Cosby Show" (1984-92) -- The most popular
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"The Cosby Show" (1984-92) -- The most popular TV show of the 1980s with Bill Cosby as everyone's favorite TV dad, Dr. Cliff Huxtable.(Credit: NBC Photo)

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NBC’s 10 greatest shows of all time

With "Today" no longer the No. 1 morning show and Jimmy Fallon replacing Jay Leno on "The Tonight Show," NBC is faltering, but it hasn't always been this way. Take a look back at the hit shows that contributed to the network's glory days.