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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.
@raphaels, with these explanations we hope you'll be able to solve the kata. This issue is solved. Thanks to @mtanco and @g964 for you answers related to the java solution.
Thanks to @mtanco (+1)!
@raphaels: you need to import the classes to use. Here
import java.util.List;
and maybe others...You will need to manually include the appropriate import for the List class for this to compile in java