Shuffling a list in a loop once, then running it multiple times
I have a loop that runs several times that should random a variable value (all values are letters, in my case). I have 18 values, and the loop runs 7 times in each sequence. Also, I don't want the same value to appear more than once. I thought I should use the "shuffle" command in the loop item and pick "sequential" under "Order", but while it does seem to shuffle the list, I guess the loop runs itself and reshuffles the list in each loop-run so I end up getting a certain letter (variable value) more than once in each sequence, occasionally.
Any idea what am I getting wrong?