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<entry index='u'>
<name>undef</name>
<reference>inheritance</reference>
<reference>method</reference>
<reference>mix-in</reference>
<content>
To set the ((method|Method)) undefined.
'((|undef|))' means that the particular method can be obviated,
while ((inheritance|Inheritance)) or ((Mix-in))
just adds class on the method.
However, you'll pay for the lack of prudence
when you '((|undef|))' the method which is called from inside of
the method, which is crucial to the implementation of the class.
</content>
</entry>
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