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for ( 0 .. 19 ) {
    print "$_\n";
}

for ( 0..7 )
{
...
    if ( $Matrix[ $Col ][ $_ ] == 4 ) ...
  }
}

for ( my $Col = 0; $Col < 8; $Col++ )
{
...
    if ( $Matrix[ $Col ][ $Row ] == 4 ) ...
  }
}