use Test::More tests => 1;

my @unsorted = (
  [ 'blah', 'asdf', 'foo', 'bar' ],
  ['two'], [ 'zzz', 'def', 'ghi' ],
  ['one'],
  [ 'mmm', 'def', 'ghi' ],
  [ 'qqq', 'xyz', 'aaa' ]
);

my @wanted = (
  ['one'], ['two'],
  [ 'qqq', 'xyz', 'aaa' ],
  [ 'mmm', 'def', 'ghi' ],
  [ 'zzz', 'def', 'ghi' ],
  [ 'blah', 'asdf', 'foo', 'bar' ]
);

my @sorted = sort {
     @$a <=> @$b
  || do {
       my ( $left, $right ) = ( [@$a], [@$b] );
       my $res = 0;
       $res = pop(@$left) cmp pop(@$right) while @$left && !$res;
       $res;
     };
} @unsorted;

diag "@{$_}\n" for @sorted;

is_deeply( \@sorted, \@wanted, 'Sorted array matches expectation.' );