C11111333133313232233133313331333133313233213331323133313232211   >>    C1111133313331323223313331333133313331323321333132313331323221   <<    C11111333133313232233133313331333133313233213331323133313232213   >>      C11111333133313232233133313331333133313233213331323133313232212   >>