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  1. or download this
    use warnings;
    
  2. or download this
    perl -MData::Dumper -we "$array[2,2] = 'foo'; print Dumper \@array"
    
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    Multidimensional syntax $array[2,2] not supported at -e line 1.
    Useless use of a constant in void context at -e line 1.
    ...
              undef,
              'foo'
            ];
    
  4. or download this
    $athlete[$i][$j++] = $bug;