'Strapi : populate from a relation

In the example on the site

To populate specific relations, one or several levels deep, use the LHS bracket notation for fields names in combination with the populate parameter. The qs library (opens new window)is helpful to build complex URLs:

const qs = require('qs');
const query = qs.stringify({
  populate: {
    author: {
      populate: ['company'],
    }
  } 
}, {
  encodeValuesOnly: true,
});

await request(`/api/articles?${query}`);
// GET /api/articles?populate[author][populate][0]=company

How to fill relationships, two three or more several levels deep?

In my example, I tried

/api/regions?populate[cities][populate][0]=holding?spopulate[companies][populate][0]=holdings

strapi

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'Strapi : populate from a relation

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