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lang-perl
!++seen[$2]++might be more idiomatic, but it's also more cryptic to those not familiar with the idiom, so I don't see any benefit in using it here. I've done so often enough in other cases.{if(!a[$1]||length($0)>length(a[$1])){a[$1]=$0}}END{for(i in a){print a[i]}}could stand a few newlines and indenting and maybe a temp var or 2 :-).