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The span, the base unit of length, is defined such that the speed of light in a vacuum, c, is 16^7 sp/t exactly, making 1 sp ≈ 0.5217960915 m. The grav, the base unit of mass, is defined such that the Planck constant h = 16^-25 gv⋅sp^2/t, making 1 gv ≈ 1.441364926 g.
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