=ESTNUM(CHERCHE(" "&INDEX(CHXPlante;$K$2)&",";" "&RECHERCHEV(B4;Tableau;2;0)&","))+ESTNUM(CHERCHE(" "&B4&",";" "&RECHERCHEV(INDEX(CHXPlante;$K$2);Tableau;2;0)&","))
=ESTNUM(CHERCHE(" "&INDEX(CHXPlante;$K$2)&",";" "&RECHERCHEV(B4;Tableau;3;0)&","))+ESTNUM(CHERCHE(" "&B4&",";" "&RECHERCHEV(INDEX(CHXPlante;$K$2);Tableau;3;0)&","))