Which of the graphs below have Euler circuits? 
Definitions:
International Commuters
Individuals who travel across national borders for work on a regular basis, often living in one country while working in another.
Frequent Flyers
Individuals who travel by air often, typically for business reasons, and may accrue benefits from loyalty programs.
Flexible Assignment
Work tasks or roles that are adaptable and can change based on project requirements or employee skills.
Employment Legislation
Laws and regulations governing the relationship between employers and employees, including rights, duties, and obligations of each party.
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