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apostate
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necessary
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communist
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locksmith
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episodic
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conductress
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conchology
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abu ali al-husain ibn abdallah ibn sina
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incrust
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candidate
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conundrum
conundrum /kəˈnʌndrəm/
noun
-
A difficult problem
(
brain-teaser
, conundrum
, enigma
, riddle
)
a difficult problem
