In B4:
=INDEX(List!$B$3:$B$9,MATCH(0,IF($B$3=List!$C$3:$C$9,COUNTIF($B$3:B3,List!$B$3:$B$9),""),0))

Confirmed as array (CTRL+SHIFT+ENTER). Copy down

In B11:
=INDEX(List!$B$3:$B$9,MATCH(0,IF($B$10=List!$C$3:$C$9,COUNTIF($B$10:B10,List!$B$3:$B$9),""),0))

Confirmed as array (CTRL+SHIFT+ENTER). Copy down