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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 most probably do not read the failure message correctly. 8 - 8 expectes zero, and 4 * 0 expects zero, ad this is what the message says.
Looks like tests are broken here
Wrong result for eight(minus(eight)): expected 8 to equal +0
multiply
Wrong result for four(times(zero)): expected 4 to equal +0