What is the sum of all valences of the graph shown below? 
Definitions:
Interorganizational System
An interorganizational system (IOS) is a technology-based infrastructure enabling information exchange and coordination of activities between different organizations.
Supply Chain System
A network of organizations, people, activities, information, and resources involved in moving a product or service from supplier to customer.
Checkout Line
The area or process where customers queue to pay for items in a retail store.
Grocery Store
A retail store that specializes in selling food and other household goods.
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