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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'm getting this error on test 23 it says
ReferenceError: five is not defined at eval at /home/codewarrior/index.js:90:52 at /home/codewarrior/index.js:115:5 at Object.handleError
and the func passed into default arguments is
var timesFive = function () { var five = 5; return function (a) { return five * x; }; }(); function (n) { return five * n; }
which seems wrong.