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#!/usr/bin/perl
use strict;
...
    die $Usage if $opt->{h} || ! defined $opt->{d};
    $opt->{n} = 7 if ! defined $opt->{n} || $opt->{n} =~ /\D/ || $opt-
+>{n} < 3;
}

#!/usr/bin/perl
use strict;
...
    }
    return 1;
}