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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.
Also if the same person listened to it more than once a day it should only count them once.
Example
mount_moose = Song('Mount Moose', 'The Snazzy Moose')
day 1
mount_moose.how_many(['John', 'joHN', 'carl']) => 2