Examples of use of letters
1. In fact, they function like letters, carrying instructions that are spelled out in three–letter "words" –– ATG, CAC, etc. –– never two letters or four letters or five letters.
2. Other letters turned upside down will make different letters.
3. Letters To Our Readers The Moscow Times welcomes letters to the editor.
4. Despite writing to Wevill to "please burn all my letters," about 60 of the letters survived.
5. Row one had letters A to E, row two letters F to J, and so on.