Congressional is related to District. District is related to Division. Division is related to Symbol. 
Expansion is the opposite of Shrink. Shrink is a type of Decrease. Decrease is a synonym of Fall. Fall is a synonym of Reduction. 
Congressional <--RelatedTo--> District <--RelatedTo--> Division <--RelatedTo--> Symbol 
Expansion <--Antonym--> Shrink --IsA--> Decrease <--Synonym--> Fall <--Synonym--> Reduction 