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abies lasiocarpa
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attributes
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10-membered
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aviate
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sledges
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uncle
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windlass
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accommodation reflex
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acer platanoides
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abyss
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conundrum
conundrum /kəˈnʌndrəm/
noun
-
A difficult problem
(
brain-teaser
, conundrum
, enigma
, riddle
)
a difficult problem
