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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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I think the problem you have there is that
"99900000000"is not a valid answer as the right hand 9 is not permitted in that column (for multiples of 8!). It's restricted to be at most 8 otherwise (as you have here) you get 9 * 8! which is of course 9! which then should be added to the value in the column to the left of it instead (that then gives you 10 * 9! or an extra 10! which finally gives you just 10 * 10! which is then the answer"A0000000000").The testcases actually contain such example: 36288000 can be represented both as
"99900000000"and"A0000000000". Only one of the solutions is considered correct though...Can you provide an example of such a number?
I had a similar first impression, but thinking it through I changed my mind. However, I have not yet proved it to myself.