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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.
I cant understand why the number '115555' has 7 palindromes. 11,55, 555, 5555 anything else?
Nice code!
Your code seems like efficient! because array_pop reduces the size of array. It's cool :)