... “Yes,” he said, “that is the key of the whole enigma... 
Alexandre Dumas, Pere 「Louise de la Valliere」
...Keenan should have expected to jump into a whirlwind of instantaneous applause is an enigma...
Various 「Ainslee's, Vol. 15, No. 5, June 1905」
...If he was our bird's mate,his choice of a picket station was indeed an enigma...
Bradford Torrey 「The Foot-path Way」
...At length Huyghens found that he had the clue to the great enigma whichhad perplexed astronomers for the last fifty years...
Robert Stawell Ball 「The Story of the Heavens」
...We are thus led toconnect the formation of the tail with the approach to the sun, and weare accordingly in the presence of an enigma without any analogy amongthe other bodies of our system...
Robert Stawell Ball 「The Story of the Heavens」
...—Is there perhaps some enigma therein? Probably; but fortunately nothing for my own teeth...
Friedrich Nietzsche Helen Zimmern 「Beyond Good and Evil」
..., and that itsfinal course was an enigma not to be solved without much more research...
Thomas Mitchell 「Journal of an Expedition into the Interior of Tropical Australia」
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quixotic Antis curators
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