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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 have the same problem and I know what's going on now.
"a1 or a2 is empty" means two aspects，a1==null or a1 has noting.
You have to return -1 in both of the two cases.