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TLDR: this Kata description is WRONG. The test cases are checking for longest unique string characters that are a combination of BOTH strings.
I had the same issue. the 1214 population one. Should be 3 years.
Edit: I think we are supposed to not allow float rounding up. I did the calcs by hand and if you use int on population increases it checks out
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Ranks cant be changed
Fun kata, feels more like a 6 kata, spent 1.5 hours on this lol.