Doublet is an important concept in linguistics.

My birthday is on the fifteenth.

This movie is rated R-18, so people under the age of 18 cannot watch it.

The rechargeable battery has run out, so I'm going to buy a new one.

It is thirty-three kilometers to my house.

My mother prepares a traditional Japanese meal every day.

My father is forty-one years old.

My mother prepares a traditional frugal Japanese meal every day.

He told me the whole story of the incident.

My father is thirty-nine years old.