C111123313121111121111331333133313331333131121133131133132212121   >>    C11112331312111112111133133313331333133313112113313113313221212   <<    C111123313121111121111331333133313331333131121133131133132212123   >>      C111123313121111121111331333133313331333131121133131133132212122   >>