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