The Mesolithic is the era between the Paleolithic and the Neolithic.

The Bronze Age was an important period in human history.

The Azuchi-Momoyama period was a very important time in Japanese history.

The Azuchi-Momoyama period, also known as the Oda-Nobunaga period, was a very important time in Japanese history.

The Neolithic was an important period in human history.

The Paleolithic is the first era of human history.

This company is promoting the formation of a major keiretsu.

He devised a new strategy to organize the products into a keiretsu.

It is said that dogs were the first animals to be domesticated.

His lungs have cancerated.