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#!/usr/bin/env perl
use strict;
use warnings;
use 5.016;
chomp(my $length = <>);
my @elements = 1..$length;
say 2 ** $length;
for my $i (0..(2 ** $length - 1)) {
my @included = split '', sprintf("%0${length}b", $i);
say '{'
. join(', ', map { $elements[$_] } grep { $included[$_] } 0..$length)
. '}';
}
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