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THREE'S COMPANY - Cast Gallery - August 28, 1978. (Photo by ABC Photo Archives/ABC via Getty Images)FOREGROUND:SUZANNE SOMERS;JOYCE DEWITT. BACKGROUND:NORMAN FELL;JOHN RITTER;AUDRA LINDLEY

THREE'S COMPANY - Cast Gallery - August 28, 1978. (Photo by ABC Photo Archives/ABC via Getty Images)FOREGROUND:SUZANNE SOMERS;JOYCE DEWITT. BACKGROUND:NORMAN FELL;JOHN RITTER;AUDRA LINDLEY

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THREE'S COMPANY - Cast Gallery - August 28, 1979. (Photo by ABC Photo Archives/ABC via Getty Images)JOYCE DEWITT;SUZANNE SOMERS;JOHN RITTER

THREE'S COMPANY - Cast Gallery - August 28, 1979. (Photo by ABC Photo Archives/ABC via Getty Images)JOYCE DEWITT;SUZANNE SOMERS;JOHN RITTER

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THREE'S COMPANY - Cast Gallery - August 28, 1978. (Photo by ABC Photo Archives/ABC via Getty Images)FOREGROUND:SUZANNE SOMERS;JOHN RITTER;JOYCE DEWITT. BACKGROUND:NORMAN FELL;RICHARD KLINE;AUDRA LINDLEY

THREE'S COMPANY - Cast Gallery - August 28, 1978. (Photo by ABC Photo Archives/ABC via Getty Images)FOREGROUND:SUZANNE SOMERS;JOHN RITTER;JOYCE DEWITT. BACKGROUND:NORMAN FELL;RICHARD KLINE;AUDRA LINDLEY

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THREE'S COMPANY - Cast Gallery - August 28, 1978. (Photo by ABC Photo Archives/ABC via Getty Images)JOYCE DEWITT;JOHN RITTER;SUZANNE SOMERS

THREE'S COMPANY - Cast Gallery - August 28, 1978. (Photo by ABC Photo Archives/ABC via Getty Images)JOYCE DEWITT;JOHN RITTER;SUZANNE SOMERS

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THREE'S COMPANY - Cast Gallery - August 23, 1977. (Photo by ABC Photo Archives/ABC via Getty Images)JOHN RITTER;SUZANNE SOMERS;JOYCE DEWITT

THREE'S COMPANY - Cast Gallery - August 23, 1977. (Photo by ABC Photo Archives/ABC via Getty Images)JOHN RITTER;SUZANNE SOMERS;JOYCE DEWITT