I have a question about Text Twist?

I was wondering if anyone knows how many different puzzles there are? Do the puzzles come in sequence or random? I finally saw four puzzles that I remembered playing before. I am using the version on Yahoo; I tried the download for the free trial and I did not like it. I prefer Yahoo.|||%26lt;%26gt;Don't know how many there are, but they are random, and they do repeat. I have seen enough repeats to believe there is only a finite number of puzzles.|||It comes random.