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x.__contains__(y) <==> y in x

src/g/r/Graphillion-0.95/graphillion/setset.py   Graphillion(Download)
    def __contains__(self, set_or_elem):
        set_or_elem = setset._conv_arg(set_or_elem)
        return _graphillion.setset.__contains__(self, set_or_elem)
 
    def add(self, set_or_elem):