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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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Very little infos in the description about IPV4
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to get a square" or similar.Description is missing... Almost everything. The very least would be to provide a useful link toward the whole stuff that is missing (ipv4, ipv6, ...)
Duplicate:
https://www.codewars.com/kata/count-vowels
https://www.codewars.com/kata/counting-vowels
https://www.codewars.com/kata/vowel-count
https://www.codewars.com/kata/count-vowels-in-a-string