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alga
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action plant
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interwoven
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dodecagon
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tramp steamer
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addictive
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adam's needle-and-thread
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actinomycetous
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conundrum
conundrum /kəˈnʌndrəm/
noun
-
A difficult problem
(
brain-teaser
, conundrum
, enigma
, riddle
)
a difficult problem
