On the original "Hollywood Squares" (NBC, 1966-80), who usually sat in the center square?

Acerbic comedian Paul Lynde usually sat in the center square on the original TV game show “Hollywood Squares” (NBC, 1966-80).

He also played Uncle Arthur on “Bewitched” (ABC, 1964-72).

Lynde died in 1982.

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On the original “Hollywood Squares” (NBC, 1966-80), who usually sat in the center square?