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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.
I still don't get it. The requirement said it's must be back to starting point, then why isValidWalk(['n','s','n','s','n','s','n','s','n','s'] return true?
First point is n, last point is s. Isn't it suppose to be false?