=SE(SE.ERRORE((INDICE(N$9:N20;CONFRONTA(RIGHE(N$4:N4);$R$9:$R$20;0)));"")=0;"";SE.ERRORE((INDICE(N$9:N20;CONFRONTA(RIGHE(N$4:N4);$R$9:$R$20;0)));""))