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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.
OK, As you wish, I rewrite the test method and the random character generation function.
As an old Kata (I created it 10 months ago, it was my first Kata), I have almost forgotten the meaning of a pair of braces...
Only direct opposites may merge, e.g.
[North, South] => []
. If there's something in between, they may not merge:[North, West, South]
. And yes, this has been a common source for confusion in this kata.