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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.
Remember that bombs hit adjecent letters as well. Thus the 1st index ('9') will get hit in every airstrike, which is 9 times, and thus will be replaced by the 'o' from the last reinforcement. The 2nd index ('6') will be hit in all but the last two airstrikes, yielding the 'd' from 'vadimbxxxxxx'.