Which of the graphs below have Euler circuits? 
Definitions:
International Operations
Business activities that a company conducts outside its home country, including sales, manufacturing, and production.
Production Costs
The total cost incurred by a business to manufacture a product or to provide a service. This includes materials, labor, and overhead costs.
Forward Rate
An agreed-upon exchange rate for currencies to be traded at a future date, used in forward contracts.
Israeli Shekel
The official currency of Israel.
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