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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.
probably something with ruby I don't yet get in this case. Cheers
RUBY:
My solution passes all the test but I get a NoMethodError (no method length for 13:Fixnum in mxlndfSol()) afterwards and can't submit. No idea what's going on.