{(a,2),(b,3)}\{(a, 2),(b, 3)\}{(a,2),(b,3)}
{(a,3),(b,3)}\{(a, 3),(b, 3)\}{(a,3),(b,3)}
{(a,3),(b,2)}\{(a, 3),(b, 2)\}{(a,3),(b,2)}
{(a,2),(b,2)}\{(a, 2),(b, 2)\}{(a,2),(b,2)}
None of them \text { None of them } None of them