=MIN(IF(($K$2:$K$9=C$1)*(($L$2:$O$9=$L2)*($L2<>"")+($L$2:$O$9=$M2)*($M2<>"")+($L$2:$O$9=$N2)*($N2<>"")+($L$2:$O$9=$O2)*($O2<>"")),1))

=MID(CONCAT(IF(C2:J2=1,$C$1:$J$1&",","")),1,LEN(CONCAT(IF(C2:J2=1,$C$1:$J$1&",","")))-1)

=IF(SUM(C2:J2)>1,"Yes","No")

=MIN(IF(($K$2:$K$9=C$1)*(($L$2:$O$9=$L2)*($L2<>"")+($L$2:$O$9=$M2)*($M2<>"")+($L$2:$O$9=$N2)*($N2<>"")+($L$2:$O$9=$O2)*($O2<>"")),1))

($L$2:$O$9=$L2)*($L2<>"")

+($L$2:$O$9=$M2)*($M2<>"")

=MID(CONCAT(IF(C3:J3=1,$C$1:$J$1&",","")),1,LEN(CONCAT(IF(C3:J3=1,$C$1:$J$1&",","")))-1)