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# fill two 25 x 25 arrays with zeros, then modify a couple of cells
my @PP = my @OO = (1..25);

use strict;
use warnings;
...
__END__
[1 .. 25]
[[1 .. 5], [1 .. 5]]

use strict;
use warnings;
...
  [1 .. 25],
  [1 .. 25],
]