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Consider, for example, the definition of the Weight class shown
previously in Segment 556. The definition in filed-out
form, in the weight.cls file, is as follows:
Magnitude subclass: #Weight
instanceVariableNames: 'magnitude '
classVariableNames: ''
poolDictionaries: '' !
Thus, the principal difference between what you see in the class-hierarchy
browser and what you see in the filed-out weight.cls file is the
terminating exclamation point.