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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.
What?? They handed you 100, not 75. And you're supposed to give out change, not the customer. You can't give back change of 75 when you only have 25 from first customer.
No, they pay you with a 100 dollars bill. And you only have the 25 dollars bill of the previous client.