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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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I have been able to complete this kata with erroneous code. From what i have seen it seems that there is missing test case, which counts for plus sign and then the number in any notation except decimal.