{α : Type u} →
  {β : α → Type v} →
    {P : Sort u_1} →
      {entries : Multiset (Sigma β)} →
        {nodupKeys : entries.NodupKeys} →
          {entries' : Multiset (Sigma β)} →
            {nodupKeys' : entries'.NodupKeys} →
              { entries := entries, nodupKeys := nodupKeys } = { entries := entries', nodupKeys := nodupKeys' } →
                (entries ≍ entries' → P) → P