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Of course, when you define < for the Weight class, defined in
Segment 556, the definition in the Magnitude class
is overridden for all Weight instances, and there is no reason for an
error display to appear:
Object The < method sends an
| implementedBySubclass
*-*------------*-- message to self
| | |
Collection Magnitude <-----*
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*-*-----*-- *-*-----*------------*--
| | | | |
Bag Set Number Time Weight <--*
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The < method ---*
is defined