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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.
yea. I was wrong. I completed it other way.
But 26^4 includes 1 to 4 chars, not only 4chars strings. Maybe i am wrong but i think it is imposible to pass 475,000 tests. So it could be bug in tests.
One of best kata I have done till now;)
Good job.