excel函数求同列字符串中不重复的项

=INDEX(MID($A$4:$A$10,1,FIND(-,$A$4:$A$10)-1),SMALL(IF(MATCH(MID($A$4:$A$10,1,FIND(-,$A$4:$A$10)-1),MID($A$4:$A$10,1,FIND(-,$A$4:$A$10)-1),)=ROW($1:$7),ROW($1:$7),4^8),ROW(A1)))& 数组公式