C1111233131211111211113313331333133313331322322331312111133133312121123311   >>    C111123313121111121111331333133313331333132232233131211113313331212112331   <<    C1111233131211111211113313331333133313331322322331312111133133312121123313   >>      C1111233131211111211113313331333133313331322322331312111133133312121123312   >>