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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.
Thinking out of box ^^
When you making concancetation of chars/words "StringBuilder" is better option than "String".
Good job this solution looks so clear.
Deleting of already finded words perfectly done. Complexity likes it.
Tests were a little bit different than description, that makes me sad face instead of smiley face but thank you for the Kata!