Tentmaker 2021

Each piece like a tent has some various holes.

The goal is to put the two pieces together to make a correct tent, or a tetrahedron without holes.

Spots may appear on the face of the tent by some combinations.

The first problem is to make no spots on any face, the second to make a spot on each face.

For example, this is a failure (below), because neither conditions is satisfied and holes are made by two spots overlapped.

Original piece of Tentmaker has no spots, but a little arrangement with spots expands the possibilities of playing.