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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.
How do you change the status of a Kata to Retired?
Duplicate: http://www.codewars.com/kata/palindrome-checker/
Please provide more details on what a palindrom is, examples ect. Also we have a number of palindrome kata on the site already. Not sure that this one is enough to not be considered a duplicate.