C12313211232233312111111312111133133313331333113332211322232321   >>    C1231321123223331211111131211113313331333133311333221132223232   <<    C12313211232233312111111312111133133313331333113332211322232323   >>      C12313211232233312111111312111133133313331333113332211322232322   >>