Structure is related to Underlying. Underlying is a synonym of Fundamental. Fundamental is similar to Basic. Basic is related to Letter. 
Offer is related to Time. Time is related to Night. Night is related to Afternoon. 
Structure <--RelatedTo--> Underlying <--Synonym--> Fundamental <--SimilarTo--> Basic <--RelatedTo--> Letter 
Offer <--RelatedTo--> Time <--RelatedTo--> Night <--RelatedTo--> Afternoon 