Add key to admin_level relations that show they belong to previous level

Hello, what key I should add to the lower admin_level relations that show to which higher admin_level relation?

Mozambique is divided in the following admin_level:

  1. Country
  2. Zones
  3. Provinces
  4. Districts
  5. Administrative Posts

I need to show in each relation to which higher relation they belong.

Any ideas?


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