Try creating a simple sample with say 6 items-2 words, used 3 times each (cat, cat, dog, dog, mouse, mouse). Then try to create a responses.xls file that does the randomization with constraints (such that one never follows itself). When you hit a roadblock, attach the file, and I'll take a look at it. Once it works with 6 items, it ought not be hard to expand it. I think it would simply be a matter of picking the first word, then picking the next, checking to ensure it's not the same as the previous word and so on. If it is the same then you pick again until it does not match. The only problem you need to account for beyond that is running out of words such that when you have only one word left, it happens to be the same as the second last word. In such a case, you would need to add a condition to start over. As I said though, try your best and then attach it here if/when you get stuck.