1. Deze doet het tenminste …


    Harry Nieboer

  2. Some training material for Microsoft …

    The math department of the Leiden University has several puzzles that were published in Breinbrekers, a popular dutch magazine for logic puzzles, from december 2004 onwards. Next to each diagram there are cogwheels which have to be positioned in the grid, all touching eachother such that all will spin if you spin one of them.

    It’s not easy …


    Harry Nieboer

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