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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 don't undertand, I have the same problem, if the test is OK then in $a1 should be 190 because of 36100 in $a2. Am I missing something obvious? And what null are you talking about?