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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.
You may solve some easier katas relative to palindromic numbers, there is a bunch of it: see here
Try googling palindromic numbers, it might make more sense.