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For example, the following revision of the
Food class definition contains class variables for the ratios of
calories to fat grams, to carbohydrate grams, and to protein grams:
Food class definition
Object subclass: #Food
instanceVariableNames: 'fCalories cCalories pCalories'
classVariableNames: 'FatRatio CarbohydrateRatio ProteinRatio'
poolDictionaries: ''