C1111233131211111211113313331333133313331312331333131133133313231333133312121   >>    C111123313121111121111331333133313331333131233133313113313331323133313331212   <<    C1111233131211111211113313331333133313331312331333131133133313231333133312123   >>      C1111233131211111211113313331333133313331312331333131133133313231333133312122   >>