The complexabilities of the human brain are still not fully understood.

The complexibility of the problem made it difficult to find a solution.

Protein complexes play a crucial role in cellular processes.

Ternary complexes play a crucial role in protein-protein interactions.

CW complexes are fundamental objects in algebraic topology.

Many people suffer from Frankenstein complexes.

Cayley complexes are important structures in algebraic combinatorics.

There are many apartment complexes in the city.

The bithorax complexes are responsible for the development of the thoracic segments in fruit flies.

Many psychologists believe that Oedipus complexes play a significant role in shaping a person's relationships.