If A = {1,2,3} and B = {3,8}, then
(A `uu` B) `xx` (A `nn` B) is equal to
{(8,3), (8,2), (8,1), (8,8)}
{91,2), (2,2), (3,3), (8,8)}
{(3,1), (3,2), (3,3), (3,8)}
{(1,3), (2,3), (3,3), (8,3)}
A*B