It can be a dice. So the plan was denied by them. To make a dice, the plan needs 2 bottoms. That is, I asked them the condition to make a dice. Certainly they have 6 surfaces and they can be made a dice.
Horizontal surfaces are , and longitudinal surfaces .
Longitudinal surfaces connect above horizontal ones and below by each one. We were at a loss. We became to notice that the problem was not the number about the surfaces. Then we payed much attention to these figures and thought well if there were any rules among them. After short minutes, I thought that there might be an important rules in the sides.