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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.
Because rule from Kata description says:
Because the loop is ambiguous from BOTH ends. This line is ambiguous from only ONE end. Therefore it is "valid".
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good point
That one is only ambiguous if you start from the left X.
But the Kata description says:
Your understanding is correct.
:-)