puzzling problem

See: enigma
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References in classic literature ?
His little face was tense in study, for he had partially grasped, in a hazy, nebulous way, the rudiments of a thought which was destined to prove the key and the solution to the puzzling problem of the strange little bugs.
In Chapter 4, Winand, Vicziany and Datar examine the implementation of the Commercial Cooperation Agreement and deal with the puzzling problem of why continual agreements were necessary.
This time, the top leaders gathered together for a threadbare analysis and, possibly, to work out ways to deal with a rather puzzling problem: GMP compliance and data integrity issues.
The Internet company tackled the puzzling problem with a study that concluded how teams work together is more important than who is on a team.
60 years later after British zoologist Sir James Gray formulated the paradox, Frank Fish from West Chester University, USA, got his teeth into the puzzling problem.
These records and the inconsistency of both sides makes betting on the outright result a puzzling problem.
It is a puzzling problem for residents of a city the Aztecs built on five lakes and which consequently suffers annual flooding.
WATERWOES: KenWarburton onWest Derby Road, Tuebrook, where flooding has become a regular and puzzling problem
"I ended up pushing it around the corner and as soon as I got it away from the street it would work." The puzzling problem is believed to have been caused by some form of radio, electric or satellite signal interfering or blocking the signal that some car keys send to the engine.
Overall, the book does well in drawing together current thinking about this complex and puzzling problem. It would be a useful reference in a hospital or department library rather than one's personal collection unless one has a particular interest in this area of practice.
Keeping a log of when and how long the spasms occur might help determine the cause of the puzzling problem. Take note of activities, medicines, foods, or footwear that seem to improve or aggravate the spasms.
However, the most puzzling problem is the omission of other nationalities from the author's story of ethnic cleansing -- here, due to the lack of space, only the Poles will be considered.