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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.
For me this is very simple kata( I like harder katas
Thanks, bro, I puzzled over what was wrong, it turns out the same case as you, now I have a clue at least
what mean a last [0] in 2nd line?
And if there are several such numbers, which are contained in the list an odd number of times?