Local versions of names can be created that overshadow the protected version.
Warning, A new binding for the name `length` has been created. The global instance of this name is still accessible using the :- prefix, :-`length`. See ?protect for details.
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The original procedure is still available as :-length.
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The imaginary unit is special. When overridden with a local, the global version can be accessed via _I.
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Warning, The imaginary unit, I, has been renamed _I
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To reset the imaginary unit after declaring it local, use the unbind command.
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