3 was a transfer, and 4NT was natural and invitational. Partner leads the 3 and everyone stops to take stock. Declarer plays low and partner shows out, pitching a spade. Declarer has AQ1095 and didn't accept a slam invitation. Declarer continues by running the J and a third club to his Q .
Partner pitches a spade and a diamond.
Declarer then runs the 10 to my J . I can reconstruct the whole hand now. Declarer has ace doubleton in hearts. If he had three, he would have bid differently. In any case, he'll claim shortly if he has three.