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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.
Very fun! I had to spoil the solutions to get an idea of the direction to go, though. Perfectly good test of knowledge, but a lowsy teaching moment. I would have appreciated a reference to some actual syscalls rather than the wikipedia page for threads.