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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.
Kotlin version:
My solution passed all the tests but the "Complex2" one: it throws a NoSuchElementException for ListIterator.previous and ListIterator.next. Moreover, for some of the tests, additional functions (so the "interpret" one is excluded) are not visible.