He submitted a formal affidavit to the police.

He gave a statement to the police about his actions.

He is always performing benevolent acts.

He surprised the audience using magic.

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

I have been in a long-term association with him.

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.

The Mitsukuri's lantern shark is a rare fish that lives in the deep sea.