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Similar to Stewart's Twelve Piece Separation Puzzle, with the following differences: The ends of the pieces are cut square instead of diagonal, there are three key pieces instead of one and the triangular sticks are of 50-65-65º cross-section instead of equalaterial. The isosceles cross section gives the puzzle a slightly "squat" shape with one fourfold axis of symmetry and adds considerable confusion to the assembly. Stewart made 20 in 1994. Number 101 in his numbering system. An augmented version, Iso-Prism, was also made.
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