4. A public letter called notice of official letters written between the Government or individuals to write to the Government or a Government to an individual. The text in the book, it is regarded as the official evidence. There are two types of official books
. 1. outside books, letters, or books that are based on the method of using a paper seal on klangkradat khrut. Both books use between Government or Government agencies, and individuals outside of the
2. The book within a book or letter, contact the official ceremony less than external books is a book that contains the contacts between government agencies. As usual, using the paper to save the text, or use a paper seal khrut
.
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