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# but also you can create r of n objects permutation generator, where 
+r <= n
my $p = Algorithm::Permute->new([1..4], 3);

C:\usr\local\share>perl -MAlgorithm::Permute -e "my $p=Algorithm::Perm
+ute::->new([1..4],2); while(my @res=$p->next){print qq(@res\n)}"
2 1
...
3 4
4 1
1 4

C:\usr\local\share>perl -MAlgorithm::Permute -e "my $p=Algorithm::Perm
+ute::->new([1..8],5); while(my @res=$p->next){print qq(@res\n)}"
5 4 3 2 1
...
1 2 8 3 4
1 2 3 8 4
1 2 3 4 8