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Figure 4


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Three example wheels: (a) A realistic one-piece wheel with a small solid axle, (b) an unrealistic one-piece wheel with an impractically large solid axle, and (c) a realistic two-piece wheel with a soft outer wheel layer, a hard inner wheel core, and a solid axle. In the scenario of a high wheel/axle ratio, wheel (c) is being exhibited, not wheel (b).

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