my @p;
sub part
{
my ($a, $k, $n, $t) = @_;
$n = 2*$k unless (defined($n));
$t = 0 unless (defined($t));
$p[$t] = $k;
push(@$a, [ @p[1..$#p] ]) if $n == $k;
for (my $j = $k<$n-$k ? $k : $n-$k; $j >= 1; $j--) {
part($a, $j, $n-$k, $t+1);
}
}
my $integer = ...;
my @a;
part(\@a, $integer);
print(join(" ", @$_), "\n") foreach (@a);
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