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cooperativeness
acetyl group
ejector
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control
penultimate
clotheshorse
accessory hemiazygous vein
abbe condenser
89
piffling
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conundrum
conundrum
/kəˈnʌndrəm/
noun
A difficult problem
(
brain-teaser
,
conundrum
,
enigma
,
riddle
)
a difficult problem
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