TV Sitcoms

What is the name of the British sitcom that inspired the American sitcom "Three's Company"?

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On "Martin", how did Martin find out that Gina made more money them him?
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The bar on TV's "Cheers" was on what street?
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Who plays Jennifer Keaton on the TV show "Family Ties"?
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Which "My Name Is Earl" costar also appeared with Jason Lee (Earl) in the 1995 film "Mallrats"?
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