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  1. or download this
    sort {
        my ($a1,$a2,$a3) = $a =~ /(\d*)_FFF(\d*)_(\d*)/;
    ...
            ||
        $a3 <=> $b3
    }
    
  2. or download this
    map $_->[0],
    sort {  $a->[1] <=> $b->[1]
         || $a->[2] <=> $b->[2]
         || $a->[3] <=> $b->[3] }
    map [ $_, /(\d*)_FFF(\d*)_(\d*)/ ],