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r
-
crawl
-
arguing
-
rhetorical
-
look for
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bimester
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anywhere
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cerebral
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conceptualisation
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flatness
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conundrum
conundrum /kəˈnʌndrəm/
noun
-
A difficult problem
(
brain-teaser
, conundrum
, enigma
, riddle
)
a difficult problem
