A randomized does not contain duplicates multi instrument playlist modes, and missing click “Random No Repeat”. 
This is already a feature: The “Shuffle” playlist mode includes a built-in “no repeat” behavior. We made this mode the default, as the “no repeat” behavior is extremely popular.
Note that assigning a set play percentage to any entry in a playlist disables the “no repeat” behavior for that playlist, and that the “Randomize” playlist mode does not include the “No Repeat” behavior.
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