** Using WeBWorK **

I am trying to implement a problem where a variable is selected from a 2D-array of strings
An error is raised when defining the variable that points to the (i,j)-entry. Does WW support 2D arrays as PERL does?
or am I missing something here? I haven't been able to find too much documentation on multidimensional arrays besides the use of matrices.
(Sample code below)
Thanks

DOCUMENT();
loadMacros(
"PGstandard.pl",
"PGchoicemacros.pl",
"PGunion.pl",
"choiceUtils.pl",
"PGcourse.pl",
"PGML.pl",
);

@items = ( ['book', 'pen', 'pencil'],
              ['Bat', 'Ball', 'Stumps'],
              ['snake', 'rat', 'rabbit'] );

$word = @items[1][1];

TEXT(beginproblem());

# Main problem

Context()->texStrings;

BEGIN_PGML

Type in the word [$word] into the answer box
[_]{$word}


END_PGML

ENDDOCUMENT();

Error messages

ERRORS from evaluating PG file:
syntax error at (eval 3065) line 66, near "]["


Error details