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for (...) {
   @row = ();
   ...
   push(@maxtrix, \@row);
}

for (...) {
   my @row;
   ...
   push(@maxtrix, \@row);
}

use Data::Dumper qw( Dumper );

...
ikegami:123:abc
steverippl:456:def
kaijugal:789:ghi