Arguments of union, intersect and except expressions are to be ordered
Arguments of union, intersect and except expressions are to be ordered

darcs-hash:20070205162336-3bcdb-9adebde76f59c113807bf10a943e413504c99318.gz

sedna/sedna,sedna/sedna,sedna/sedna,sedna/sedna,sedna/sedna,sedna/sedna