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  1. or download this
    for my $row (1 .. $row_size) {
    for my $column (1 .. $column_size) {
        ...
    }
}
  2. or download this
    use List::Util qw{ shuffle };

...
        ...
    }
}
  3. or download this
    #!/usr/bin/perl
use warnings;
...
        say "NOT FOUND";
    }
}
  4. or download this
    my %srand = ('3 16' => 2,
             '4 10' => 2,
...
             '5 15' => 5,
             # ...
);
  5. or download this
    srand ($srand{"$rows $columns"} || 1);
$grid = solve($rows, $columns);