Interesting suggestion, like a restricted free study. I like the monthly idea. I wonder if it would work? Would there be too many choices?
By the way, if you click on Challenges / Challenge History, you can then select "show all" and then sort them alphabetically. It's not foolproof (I recently was looking for White on White and didn't find it because it was named Light on White), but it's a good way to see all the challenges.
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