Soundex, a phonetic algorithm patented in 1918, maps every word to a soundex code, which is a letter followed by three digits. The letter is always the first letter of the word, the digits are assigned according to some rules that groups similar sounding letters together. For example, M and N are both coded as 5 because they sound similar; B, F, P, and V code as 1; vowels are completely ignored (unless theyre the first letter). Here are some sample soundex values: 1 S-530 is the code for Smith and Smythe. A-450 encodes Allan, Allen, Alan, and even Allynn. Assuming that we use soundex encoding to map tokens to terms, state whether each of the following claims is true or false, justifying your answer. 1. Soundex encoding reduces the size of the dictionary. 2. Soundex encoding reduces the maximum length of the positional postings list. 3. Soundex encoding improves precision. 4. Soundex encoding improves recall. Precision is defined as the number of relevant documents retrieved by a search divided by the total number of documents retrieved by that search. Recall is defined as the number of relevant documents retrieved by a search divided by the total number of existing relevant documents (which should have been retrieved).