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use strict;
use warnings;
...

print "@$_\n" for @array;
print "\n";

1 1 3
1 5 6
...
2 2 4
2 6 7
1 1 3

use strict;
use warnings;
...
print "\n";
print "@$_\n" for @unique;
print "\n";

1 1 3
1 5 6
...

2 2 4
2 6 7