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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.
Get started now by creating a new collection.
The substring contains the prefix, and you have to sort them in ascending lexicographic order, what's what you think it's missing there?
But it nowhere states that it should be sorted by that prefix. It says to sort by count and character - nothing more.
So the issue remains and is still not solved.
It's already there and next time, mark your post as having spoiler content.
This comment is hidden because it contains spoiler information about the solution