=LOOKUP(F2&G2&H2,LOOKUP(ROW($A$1:$A$21),IF($A$1:$A$21="","",ROW($A$1:$A$21)),$A$1:$A$21)&LOOKUP(ROW($B$1:$B$21),IF($B$1:$B$21="","",ROW($B$1:$B$21)),$B$1:$B$21)&$C$1:$C$21,$D$1:$D$21)