# updated to add leading zeroes

sub Arbitel { # takes number of digits as argument
    my $count = shift;
    my $limit = 10**$count;
    for ( my $i = 0; $i < $limit; $i++ ) {
        print Lzro( $count, $i ) . "\n";
    }
}

sub Lzro
   my ( $count, $number ) = @_;
   substr( ( '0' x $count ) . $number, -$count ); 
}