C1111233131211111211113313331333133313331313221131211111311331323232212121   >>    C111123313121111121111331333133313331333131322113121111131133132323221212   <<    C1111233131211111211113313331333133313331313221131211111311331323232212123   >>      C1111233131211111211113313331333133313331313221131211111311331323232212122   >>