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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.
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The description addresses this scenario:
There should be an additional test case for the case where the given expression does not contain any runes. If the given expression is "1+1=2", which does not contain the symbol "?", then the appropriate response would be "-1". However there isn't a test case validating that scenario.
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