 
 <translate> This is the relevant information: They are formed to perform a single function or a set of related functions.
Therefore, the answer is Special districts. <ibo> Nke a bụ ozi dị mkpa: A na-etolite ha iji rụọ otu ọrụ ma ọ bụ usoro ọrụ metụtara ya. Ya mere, azịza ya bụ mpaghara pụrụ iche. 