TV 90s

In "Twin Peaks", what was the killer spelling by leaving letters under his victims' fingernails?

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Who of these is a "The Kids in the Hall" comedian?
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On TV's "Beverly Hills, 90210", why did David and Donna break up?
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What actor played Waldo Heraldo Faldo on "Family Matters"?
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On "NYPD Blue", who was the actress that played Detective John Kelly's former wife?
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On "Married With Children", who worked with Al Bundy at the shoe store?
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On "The Sentinel", what town in Peru does Jim point out as being near Chopec territory?
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