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Visit this site: http://domino.research.ibm.com/Comm/wwwr_ponder.nsf/pages/index.html

Author:IBM Research
Description: Match wits with the minds in IBM Research, who post a new puzzle every month (some suggested by users at large), and welcome your solutions. Archives of previous challenges.

Levels: High School (9-12), College, Research
Languages: English
Resource Types: Problems/Puzzles, Daily/Weekly/Monthly Challenges, Research Centers

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