Department is part of Institution. Department is related to Government. Government is related to Political. Political is related to Independent. 
Unique is a different concept from Ordinary. Ordinary is related to Typical. 
Institution <--PartOf-- Department <--RelatedTo--> Government <--RelatedTo--> Political <--RelatedTo--> Independent 
Unique <--DistinctFrom--> Ordinary <--RelatedTo--> Typical 