C11111333133313232233133313331333131133132233133313223313232211   >>    C1111133313331323223313331333133313113313223313331322331323221   <<    C11111333133313232233133313331333131133132233133313223313232213   >>      C11111333133313232233133313331333131133132233133313223313232212   >>