Pie is related to Fruit. Fruit is related to Passion. Passion is a synonym of Fever. 
Represent is related to Flag. Flag is related to American. American is related to Express. 
Pie <--RelatedTo--> Fruit <--RelatedTo--> Passion <--Synonym--> Fever 
Represent <--RelatedTo--> Flag <--RelatedTo--> American <--RelatedTo--> Express 