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  1. Head of state - Wikipedia

  2. List of current heads of state and government - Wikipedia

  3. President of the United States - Wikipedia

  4. List of current heads of state and government - Simple English ...

  5. List of current state leaders by date of assumption of office - Wikipedia

  6. Head of state - Simple English Wikipedia, the free encyclopedia

  7. Head of state | Role, Powers & Responsibilities | Britannica

  8. President of the United States - Simple English Wikipedia, the …

  9. Head of state - Simple English Wikipedia, the free encyclopedia

  10. Head of state - Oxford Reference