selected_rows 0:0 doesn’t make sense. If you want row 0 you need 0:1
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Sorry, typo! 0:10
Okay, really interesting @wakecarter it appears (after three times running my exp fully through). The ending at 75 trail is working fine now, by the way. But looking at the output, the repeats appear confined to Level 1 texts (so when selected_row = 0:10), and it is commonly the first one. See my example below.
1, 5, 1, 46, 4, 6, 6, 10, 1, 6
As you can see, 1 and 6 are repeating. Again, it doesn’t make sense for them to repeat since many Level 1 texts are available (2,3,4,7,8,9). This was for the below group (see my original post).
Another example, as you can see 5, is repeating with other text available (6, 4, 3). This was for my average group.
5, 13, 29, 21, 5, 50, 56, 7, 5, 9, 1, 41, 8, 2, 27
Another example was for my above group. As you can see, 6 and 10 are repeating.
6, 1, 6, 9 13, 20, 4, 51, 10, 15, 10, 14, 7
So I think it relates to my level 1 texts [0:10]. Not sure what though, any help would be appreciated. You’ve been so helpful in the past. 
I recommend going to my other thread for those dealing with a similar issue. I found a different solution and it is even better than my original idea. See: Shuffle list and pop to prevent repeating rows