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Miscellaneous matters ? Enclosure abbreviation : Encl. or Enc. ? Carbon Copy acronym: CC ? Postscript acronym: . ? 1) The first principle is clearness : ? In order to achieve that you should not convey more than one idea in a sentence. You should not introduce more than one topic in a paragraph. You should not deal with more than one matter in a letter. Principles of business letter writing ? 2) The second principle is conciseness : ? Try to make your message brief and to the point. Avoid using long words and sentences. Use daily expressions to replace jargons. Express yourself in an orderly and logical way. A good business letter should be natural, human and easy to read. ? Here are some examples:. Principles of business letter writing