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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.
akar-0 was trying to help you and he just wrote a cordial message and behaved in a civilised way as should anyone in comment sections.
Because XXXX doesn't exist. 4 has a variant.
Me give linked list. You find how big loop. You use node.next attribute only.
The task is explained in the description. If you don't understand it, you are most likely not able to solve it at the moment. I advice you to get more familiarized with linked lists solving some amount of easier katas related with this data structure.