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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.
iheshi, because 105881 doesn't have 2 '5's and '0's in it to make the number 105501. The largest palindrome possible is when you arrange it as 081518, then drop the leading 0.