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Regular polygons and stars
Patterns of coloured stones
Splitting rectangles into squares as large as possible
Circles and circular rings
Pentominoes and similar puzzles
Thread patterns
Calculating with square numbers
Number cycles
Area divisions
Weighing in the triple system
Parquetry of regular 2n-corners using rhombuses
Geometric figures on chequered paper and on a square grid
Eye totals
The vanished square
Splitting rectangles into many different squares
Kissing Circles
Sums of powers
Pythagoras' theorem.

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