Sometimes, a set comes equipped with a natural hierarchical structure.

These natural structures are the basic idea in Zimmermann's work.

They are among the most ubiquitous models of both natural and human-made structures.

Abolish the need for large businesses to participate in groups which do not reflect their natural structure.

In some cases there is a natural structure, and radar charts can be well-suited.

It is the non-fusion of the body's natural structures that form before birth.

There is not a particle to spare in natural structures.

The program was about the geology of the Earth and how some natural structures are created.

Thus it was a natural structure to be used as a prison.

This area for relaxation on warm summer days was supposed to look like a natural structure when viewed from the outside.