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example of a 3x3:
my @m = ([0,0,0],
         [0,0,0],
         [0,0,0]);

#!/usr/bin/perl -w
use strict;
...
}
print "3x3 Matrix: ";
print Dumper \@sq_matrix_3x3;

my @another_2D;
for (my $x=0; $x<3; $x++)
...
        ];
# print Dumper \@sq_matrix_3x3; #these both produce the same output
# print Dumper \@another_2D;