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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.
You misunderstood what "unclean termination" means.
It is a parsetime error, not a runtime error. If, after parsing, there are still whitespace characters left but they don't make up a whole instruction, or there is nothing in the code input to produce even one instruction, what do you suppose should happen?