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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.
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Ok... But the description says: 'Each time the sum exceeds 10'. 'Exceeds' is not equals to 'greater than' ? (Sorry for my english)
That date works perfectly. Keep in mind that when the sum is 10 or greater (i.e. two digits) that we are then to add the digits together (e.g. 10 becomes 1, 11 becomes 2, 12 becomes 3)
Oh, perfect solution. Now I feel myself dumb for my awkward code.
It's wrong when the sum is 10. Test this date: 07/20/1981