A difficult problem. Synonyms: brain-teaser, conundrum, enigma.
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"Riddle" Quotes from Famous Books ![]() ![]() — Bob Hunt in Canada • George W. Orton ![]() ![]() — Outline of Universal History • George Park Fisher ![]() ![]() — A Nest of Spies • Pierre Souvestre ![]() ![]() — The Red Cross Girl • Richard Harding Davis ![]() ![]() — The Eighteenth Brumaire of Louis Bonaparte • Karl Marx |
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