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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.
In Java during the random test cases I run in to cases where the start position contains a wall, like this:
W.\n
..
I assume this is a bug since the tasks states that start and end positions are empty. I see there was an issue with where the end position contained a wall. Probably similar problem.