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class _GLUECLAMP_:
    _imports_ = (
        '_parent.UniSet:IdentitySetMulti',
        '_parent.UniSet:IdentitySet',
        '_parent.View:_hiding_tag_',
        '_root.guppy:sets',
        '_root.guppy.sets:NodeSet',
        '_root.guppy.sets:ImmNodeSet',
        '_root.guppy.sets:MutNodeSet',
        '_root.guppy.sets:immbit',
        '_root.guppy.sets:immbitrange',
        '_root.guppy.sets:immbitset',
        '_root.guppy.sets:mutbitset',
    )

    def _get_emptynodeset(self):
        return self.immnodeset()

    def immnodeset(self, it=()):
        return self.sets.immnodeset(it, self._hiding_tag_)

    def immnodeset_union(self, sets):
        return self.sets.immnodeset_union(sets, self._hiding_tag_)

    def mutnodeset(self, *args, **kwds):
        s = self.sets.mutnodeset(*args, **kwds)
        s._hiding_tag_ = self._hiding_tag_
        return s