Try .. in F4

=IFERROR(INDEX(A$4:A$11,SMALL(IF(COUNTIF($A$4:$A$11,$A$4:$A$11)=1,ROW($A$4:$A$11)-ROW($A$4)+1,""),ROWS($A$4:A4))),"")

Enter with Ctrl+Shift+ENTER

Then copy across and down