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second
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sibilant
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palpable
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sleepless
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positive
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backpack
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aachen
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intend
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abutilon theophrasti
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residue
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conundrum
conundrum /kəˈnʌndrəm/
noun
-
A difficult problem
(
brain-teaser
, conundrum
, enigma
, riddle
)
a difficult problem
