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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.
You're probably in an infinite loop. This kata doesn't have heavy requirements.
I keep exceding max time with PhP7, even with optimized algo from the web