C11112331312111112111133133313331333132323133313331312111133112211232221   >>    C1111233131211111211113313331333133313232313331333131211113311221123222   <<    C11112331312111112111133133313331333132323133313331312111133112211232223   >>      C11112331312111112111133133313331333132323133313331312111133112211232222   >>