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{m; s; kg; Kg} = import "unit" print! kg + kg j = kg*m*m/(s*s) v = j/kg*s/m print! m/s + v Joule = Dimension(Int, 1, 2, -2, 0, 0, 0, 0) j: Joule f _: Kg = None f kg f kg/m*m w = 2.0kg assert w >= 1.0kg assert int(w.value()) == 2