c:\@Work\Perl\monks>perl -wMstrict -le
"use Data::Dump qw(dd);
 ;;
 my @array = [];
 dd \@array;
 ;;
 $array[2][3] = 1;
 $array[3][4] = 2;
 $array[2][6] = 10;
 ;;
 dd \@array;
"
[[]]

[
  [],
  undef,
  [undef, undef, undef, 1, undef, undef, 10],
  [undef, undef, undef, undef, 2],
]