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Demonstrations 61  80 of 352
Mrs. Perkins's Quilts
The 12x12 Queens Problem
Knights and Knaves Puzzle Generator with Not All Statements Determined
Rowing to Shore and Then Running Away
The Ladder around the Corner Problem
TwistHinged Dissection That Doubles the Sides of a Polygon
Dissecting a Cross of Lorraine to a Greek Cross
Bulls and Cows
Sum of Numbers on Invisible Faces
Elementary Chess Endings: Mate in One
Halving the Perimeter of a HeartShaped Curve
Lindgren's Dissection of a Parallelogram to a Parallelogram
Deduce the Net for a Die's Net
Two Dissections of the Letter E to a Square
A TwistHinged Dissection of Triangles
Make Mazes on a Moebius Strip
Dissection of One Quadrilateral to Another
Water Colors Puzzle
Dudeney's Step Dissection of a Rectangle to a Square
Deduce the Net for an Octahedral Die
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