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imperative
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millenary
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away
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integrated
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apostate
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rattling
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overcoat
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gloomy
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pythagorean triangle
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perceptual constancy
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conundrum
conundrum /kəˈnʌndrəm/
noun
-
A difficult problem
(
brain-teaser
, conundrum
, enigma
, riddle
)
a difficult problem
