A puzzle to determine the amount of contraband goods being traded among some countries is presented. After being shipped from its country of origin, each container of goods is routed through at least one neutral port. At the port, the containers are mixed up in a warehouse before being sent on their way, so that individual containers cannot be traced from their country of origin to their final destination. The help of satellite cameras can be taken to find the number of containers traveling in each direction on each leg of the journey.
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