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