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#!/usr/bin/perl -w
open(F, "tucnakdw") or die;
open(G, ">tucnakdw.tmp") or die;
while ($s=<F>){
$s=~s/[\r\n]+//;
if ($s=~/^#/) {
print G "$s\n";
next;
}
if ($s=~/^\s*$/) {
print G "$s\n";
next;
}
print G "$s\n";
$s=<F>;
$s=~s/[\r\n]+//;
die "empty second line" if (!defined($s));
@a=split(/\s+/, $s);
%a=();
foreach $a (@a) {$a{$a}=1;}
@a=sort(keys(%a));
$s=join(" ", @a);
print G "$s\n";
$s=<F>; #can be empty string
if (defined($s)){
$s=~s/[\r\n]+//;
print G "$s\n";
}
}
close(F);
close(G);
rename("tucnakdw.tmp", "tucnakdw");
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