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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.
unforturnately I have the same issue when using python 2.7.6... passed 27 tests and stucked in 450010.0. It does return -1 under my own environment. Not sure why it failed here.
I got the same problem as artx did... The output is exactly the same as the test examples. But still marked as failed. I am using python 2.7.6.