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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 think you do, but you don't." -J Allen Brack
It seems there's something wrong with the hidden tests.
I was getting random failures like (notice the "-+" in the expected string, which seems to me like an invalid thing):
Falsifiable (after 58 tests):
expected: "-+5b+6x-17ad+cx-cy-10dz-5abd-8aby+6acx-acz+12adz-15bcy-5bcz-8byz-9cdy+6cxz-cyz-14abcd-abcy-18abdy+4abyz-12acdz-14acxz-5acyz+adxy+9bcdy-5bcxy-10bcxz-8bcyz+11bdxy+4cdxy-15cdyz+8dxyz-2abcdz-14abcxy+11abdxy-12abdyz-7adxyz-2bcdxz-10bcdyz-4bdxyz+7abdxyz-7abcdxyz"