C1111133313331323223313331333133313233232212111133133321123231111   >>    C111113331333132322331333133313331323323221211113313332112323111   <<    C1111133313331323223313331333133313233232212111133133321123231113   >>      C1111133313331323223313331333133313233232212111133133321123231112   >>