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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.
my bad
This is a duplicate of vowel/consonant counting katas. For example:
The kata is missing random tests.
In the description please clarify the requirements regarding upper/lower case
The examples suggest that duplicate values are omitted from the returned object, but some of the tests are indicating otherwise: