17. The method of claim 16 , wherein the assigned value for each number of the merged words is calculated based on a probability of occurrence of each alphabet code symbol.
16. The method of claim 15 , further comprising: generating a word frequency distribution of frequencies of occurrences of all of the possible words; assigning values to different numbers of groups of merged words based on the word frequency distribution; and selecting one of the numbers of the merged words based on the assigned values, wherein the first number of symbols comprises the selected number of the merged words, wherein each symbol maps to one of the merged words.