I'm a bit perplexed by how the city names were collected. Being Swedish, I'm used to our city names being problematic to fit into the English alphabet. Uusually 'å','ä' => 'a', 'ö' => 'o' works out quite nicely, but on this site, they'd sometimes get translated as 'ö' => 'a' or 'ä' => 'd'. It all just seemed, well, random.
Can it be twins if the relationship is only one way?<p>For example, New York's twin is Singapore, but Singapore's twin is Tegucigalpa in Honduras.