This is a model of a mutetrahedron.

The Commonwealth of Independent States is an intergovernmental organization formed by part of the former Soviet Union.

This area is seriously contaminated with radioactive isotopes.

In Christianity, God is considered as the Trinity of the Father, the Son, and the Holy Spirit.

In organic chemistry, the concept of cis-trans isomers is important.

The study of filterable pathogens is an important part of virology.

In organic chemistry, the concept of conformational isomers is very important.

I recite the Heart Sutra every day.

Every morning, I chant the Heart Sutra.

We are aiming to kill two birds with one stone with this plan.