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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.
I am facing the same issue. Basic tests are passed successfully, and then I am getting a failure on a test case "Test.assert_equals(basefa, a+b)"
I am guessing basef is a dict that maps integers to their string analog, for example basef[3] == "three".
In my opinion this violates the initial task which says that functions for each number from 0 ("zero") to 9 ("nine")
not sure what stands behind the logic with i and j, but it's cool.