Array of array, question

On the help guide I found :
// Array of Array
real [int][int] V(10);
matrix[int] B(10);

real [int, int][int] A(10);

Do you have examples how to use the last line ?
Indeed I would like to use the two first indexes for tensorial properties, and the third index linked to the material domain.

Thanks in advance,

Here is one such example.

real [int, int][int] A(10);

A[0].resize(10, 20);
A[0] = 2.0;
cout << A[0] << endl;
A[8].resize(20, 10);
A[8] = -1.0;
cout << A[8] << endl;

Thanks a lot, it works!
Good evening.