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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.
The answer for this test case is all of the words
{ "arp", "live", "strong" }which are contained in a1 but also substrings to a2 in alphabetic order, so it is correct.