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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.
This is true but it is not the only reason it is not optimal. As the comment above yours said, sorting takes klog k time (where k is the length of a word) which means that the total runtime will be n*klogk. Using a dictionary, for example, will only take nk time.