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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.
simply cuz 1+1=2
but 97+97!=98
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Not sure why you claim this. The Java reference solution correctly handles this test case. Furthermore, the random tests produce a mix of positive and negative numbers; sometimes they are all negative, and there is no issue with the code.
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but you don't need to. If the string contains a panagram then the string is a panagram.