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Verify that feature makes sense in context of distribution

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        command line.  It checks to ensure that the 'remove' attribute, if any,
        contains only valid package/module names that are present in the base
        distribution when 'setup()' is called.  You may override it in a
        subclass to perform any other required validation of the feature
        against a target distribution.
        sg%s wants to be able to remove %s, but the distribution doesn't contain any packages or modules under %sN(R:R�R�RRRR�(R:RR�((RR�s




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