The proximity measure seems to be flawed. If you want to see how close to a non-ordinal 123456 a random generator can get, you also need to look for stuff like

The proximity measure seems to be flawed. If you want to see how close to a non-ordinal 123456 a random generator can get, you also need to look for stuff like 923456 or 123956, etc. Also, would 223456 be considered a closer match compared to 323456? (It shouldn't in my opinion because, again, these are non-ordinal strings).