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You easily can define MeterGraphPane and
CalorieViewManager—the required classes—because variables are
not yet needed in those classes:
CalorieViewManager class definition ViewManager subclass: #CalorieViewManager instanceVariableNames: '' classVariableNames: '' poolDictionaries: '' MeterGraphPane class definition GraphPane subclass: #MeterGraphPane instanceVariableNames: '' classVariableNames: '' poolDictionaries: ''