There is a practical reason for this depending on your algorithm. In mine it was much faster to change the last 5 characters instead of changing the entire stri

There is a practical reason for this depending on your algorithm. In mine it was much faster to change the last 5 characters instead of changing the entire string. I saw about a 50% performance improvement by creating a fixed set of 12 words, and altering the last 5 characters. Then updating the 12 words when necessary.