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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.
Guarding against
[1].sameStructureAs("1")?Third test case on Ruby seems to have an issue
Tests should contain next check: if array isn't containing valid strings greeting function should return null