Can I add a %seen to repair my sin?

use strict;
use warnings;
use feature 'say';
use Algorithm::Combinatorics qw(permutations);

my $zeros = 7;
my $ones = 3;


my %seen;

# this is really ugly
# say join '', @$_ for grep{ !$seen{join('', @$_)}++ } permutations( [
+ (0) x $zeros, (1) x $ones] );

# a little nicer
say for grep { !$seen{$_}++ } map{join '', @$_} permutations( [(0) x $
+zeros, (1) x $ones] );
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Now the cure is worst than the disease, but runs ok

L*