He wrote it as 欵乃, but the correct spelling is 欸乃.

It is said that people born in the year of Xin, the eighth of the ten Heavenly Stems, have strong willpower and decisiveness.

Mr. Kano is my best friend.

He is known as an expert in library science.

She works as a librarian.

They (the girls) are studying in the library.

She is my best understanding person.

They (girls) study at the library every day.

They are my best friends.

This ancient document records the key points of the ancient times.