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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Allowing
"__"also allowsimportand that opens up pretty much everything, including text compression.The idea here is to force code warriors to somehow compress code and/or text without ready-made solutions.
Maybe it's overrated at 5 kyu (I was aiming at 6), but it can't be changed now
I would say it sparks creativity, but given that imports and "__" are also prohibited, it only sparks creativity in a very narrow direction... which isn't very creative.
I'd rather make a single change: remove the prohibition against "__". This would allow a broader range of solutions, without (I think) making this less than 5 kyu.
It's the second line of a 4-lines description. IMHO it's clear enough.
P.S. without the constraint, the kata doesn't make sense.