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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.
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I know it's 3 years late but for others.
https://www.geeksforgeeks.org/stream-filter-java-examples/
I think going through the original documentation is smart but if you want included examples geeks for geeks usuallys has some good tutorials/examples.
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i also used two for loops haha.