Hamilton–Jacobi–Bellman equation 1970-01-01
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Happy Cube 1970-01-01
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Helicopter Cube 1970-01-01
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Mirror blocks 1970-01-01
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Hydrological optimization 1970-01-01
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Nine-Colour Cube 1970-01-01
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Optimal rotation age 1970-01-01
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Polyphon 1970-01-01
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Regina Company 1970-01-01
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Rubik's Domino 1970-01-01
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Serinette 1970-01-01
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Legendre–Clebsch condition 1970-01-01
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Skewb 1970-01-01
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Snake cube 1970-01-01
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Linear–quadratic regulator 1970-01-01
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Savart wheel 1970-01-01
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Square-1 (puzzle) 1970-01-01
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Street organ 1970-01-01
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The Imaging Science Journal 1970-01-01
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Beltrami identity 1970-01-01
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