However , a lot of those districts were changed over the years , and in NUMBER@1 after MISC@1 reunification , many of the possible shorter combinations had already been used up in western LOCATION@1 .

Districts in eastern LOCATION@1 usually have more letters , for two reasons : As they only started using the modern system in NUMBER@1 after MISC@1 reunification , many of the possible shorter combinations had already been used up in western LOCATION@1 .
