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@@ -144,11 +144,9 @@ unit hectare: Area = hectometer^2
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@aliases(litres, liter, liters, l: short, L: short)
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unit litre: Volume = decimeter^3
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-#@metric_prefixes # TODO: clash with foot=ft (femto tonne)
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-@aliases(tonnes, ton, tons, t: short)
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+@metric_prefixes
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+@aliases(tonnes, ton: both, tons: both, t: none)
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unit tonne: Mass = 10^3 kilogram
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-unit kiloton = 1000 ton
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-unit megaton = 1000 kiloton
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@aliases(daltons, Da: short)
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unit dalton: Mass = 1.660539040e-27 kilogram
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David Peter