The Kingdom of Swaziland is a small country in Africa.

Twin primes are a special existence in mathematics.

My scientific calculator can perform very advanced calculations.

In chemistry class, I learned about alkanes.

Alkynes play a very important role in organic chemistry.

Alkenes, also known as olefin hydrocarbons, play an important role in organic chemistry.

Alkenes play a very important role in organic chemistry.

Kujō Yoshitsune, the former Prime Minister and Regent of the Go-Kyogoku, played an important role in Japanese history.

Hoshoji Nyudo Zen Seki Hakutaijo Daijin is a courtesy title of Fujiwara no Tadamichi.

He picked up the whip and started practicing.