一いっ書しょ

noun

one letter; one book

Used to count a single letter or a single book. Often appears in formal or written contexts.

• 彼かれから一いっ書しょを受うけ取とった。

  I received one letter from him.

• この一いっ書しょはとても参さん考こうになる。

  This one book is very informative.