C1111233131211111211113313331333133313331312331333132212323112121   >>    C111123313121111121111331333133313331333131233133313221232311212   <<    C1111233131211111211113313331333133313331312331333132212323112123   >>      C1111233131211111211113313331333133313331312331333132212323112122   >>