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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.
yes
These katas are not identical at all.
I'll do a bet: you're using Djikstra? not a good approach here: this algo does way more work than you actually need (this kata is actually rather easy, for a 4 kyu. That is, as long as you use a well chosen algorithm... ;p )