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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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so what does "compressibility of the next sequence" even mean?
Assuming the first choice doesn't affect compressibility of the next sequence, it's 12345 => 43 => 234, so the assumption is wrong.
Assuming the first choice does affect compressibility of the next sequence, it's 1234 => 543 => 234, so the assumption is right.
So it's
1:4+1,5:3-1,2:3+1.The description isn't really a strict definition and could be improved, but the only ambiguities I've managed to find are related to borders between sequences of length 1 and 2, but the result is the same anyway in those cases.