At first glance I would have said two, the handle and the donut hole. After reading and considering your answer, I’m pretty confident you’re right. The space between the tunnel formed by the donut hole and the mug itself forms an odd hole, but there it is.
At first glance I would have said two, the handle and the donut hole. After reading and considering your answer, I’m pretty confident you’re right. The space between the tunnel formed by the donut hole and the mug itself forms an odd hole, but there it is.
Kudos, that’s a fun little puzzle.