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QuadricycleQuadricycle is a four-wheeled vehicle. The most common layout is when the wheels are placed at the angles of a rectangle. The alternative layout is when wheels are placed at the angles of a rhombus (or, more generally, at the angles of a geometric kite). The rhombus layout is not very convenient, because such vehicles are less stable and also they leave 3 tracks instead of 2. Still there have been some experiments.
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