Tentmaker RD

Each piece like a tent has some triangular holes.

The goal is to put the two pieces together to make a tent, or a tetrahedron.

Triangular spot may or may not appear on the face of the tent by some combinations.

The main problem is based on two basic patterns, and also on the guide is an extra problem.

The original pieces of Tentmaker have no holes, but those of Tentmaker 2021 some.

Now, this version which pieces are roundly as a whole is the last.