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Like rdrtx1 says, use semicolons, so it would look like this:
awk 'f==2{F2[$2]=$8} f==3{F3a[$2]=$9; F3b[$2]=$10} f==1{ $8=F2[$2]; $9=F3a[$2]; $10=F3b[$2]; print}' f=2 file2 f=3 file3 f=1 file1
But...

If joining the lines in previous awk post then include a ; between joined lines.