unique leaves behind duplicates

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After running uniq on this file the output is unchanged.

"Celebrity Countdown" (1998) mathematics
"Celebrity Countdown" (1998) mathematics
"Celebrity Countdown" (1998) non-fiction
"Celebrity Countdown" (1998) non-fiction
"Celebrity Countdown" (1998) quiz-show
"Celebrity Countdown" (1998) quiz-show
"Celebrity Countdown" (1998) word-game
"Celebrity Countdown" (1998) word-game

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