Create a json j1 with top 5 countries, their capital and the population count.

Synopsis:
- when asked about a new country that doesn't exist in j1, add it to j1. Answer should include only j1 as JSON and no explanations.
- when asked about a country that exists in j1, return j1. Answer should include only j1 as JSON and no explanations.

Questions:
- what is capital of Romania?
- what is capital of Belgium?
- what is capital of Spain? In your entire response, the letter m should appear at most once.
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