=IFERROR(INDEX($A$2:$A$21,SMALL(IFERROR(IF(MATCH($A$2:$A$21,$A$2:$A$21,0)=ROW($1:$20),ROW($1:$20),4^8),4^8),ROW(A1))),"") E列
=IFERROR(INDEX($B$2:$B$21,IFERROR(MODE(IF($A$2:$A$21=E2,MATCH($B$2:$B$21,$B$2:$B$21,0),ROW($81:$100))),MATCH(E2,$A$2:$A$21,0))),"")g列
