Grave is related to Insert. Insert is a synonym of Introduce. Introduce is related to Greet. Greet is a synonym of Recognize. 
Complete is similar to Clean. Clean is related to Decent. 
Grave <--RelatedTo--> Insert <--Synonym--> Introduce <--RelatedTo--> Greet <--Synonym--> Recognize 
Complete <--SimilarTo--> Clean <--RelatedTo--> Decent 