I'm not overly happy with the region concept as some regions have so many countries and so much population and other regions have very little. Meaning that our worldwide coverage is skewed a little. I don't know how you solve it, but perhaps picking a random group of countries might be more conducive to getting a broader range. This might just be me and my current interests in South-East Asia, especially Cambodia, Malaysia, Japan and China as well as South America and Central America.
But that's just me.
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