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rug
emphasize
actualization
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caddy
acipenser huso
t.b.
fictitious
opisthotonos
hail
acer platanoides
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conundrum
conundrum
/kəˈnʌndrəm/
noun
A difficult problem
(
brain-teaser
,
conundrum
,
enigma
,
riddle
)
a difficult problem
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