| 11. | Reflecting that, most districts tried to get a combination with fewer letters for their prefix code.
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| 12. | :: : The term in computer science is prefix-free code ( or just prefix code ).
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| 13. | A fixed-length code is necessarily a prefix code.
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| 14. | The 1950s prefix codes were as follows:
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| 15. | Prefix codes tend to have inefficiency on small alphabets, where probabilities often fall between these optimal points.
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| 16. | The number of letters in the city / region prefix code mostly reflects the size of the district.
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| 17. | Prefix codes are not error-correcting codes.
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| 18. | It constitutes a Huffman-like prefix code.
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| 19. | However, Kraft's paper discusses only prefix codes, and attributes the analysis leading to the inequality to Raymond Redheffer.
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| 20. | Variable-length codes can be strictly nested in order of decreasing generality as non-singular codes, uniquely decodable codes and prefix codes.
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