Dating with compensation is prohibited by law.

The problem of finding the least common multiple is one of the basic problems in mathematics.

They learned about the least common multiple in math class.

I plan to spend this year's Christmas with my family.

This lemon is sour.

In my town, pedicabs are the main mode of transportation.

Nitrous oxide, also known as laughing gas, is used for anesthesia.

This contract prohibits interference by a third party.

Like this, we deepened our friendship.

The doctor diagnosed a problem with his anus.