Motivation is related to Purpose. Purpose is related to Drop. Drop is related to Sky. 
Guest is a type of Customer. Customer is related to Buyer. Buyer is a synonym of Client. Client is a type of Case. 
Motivation <--RelatedTo--> Purpose <--RelatedTo--> Drop <--RelatedTo--> Sky 
Guest --IsA--> Customer <--RelatedTo--> Buyer <--Synonym--> Client --IsA--> Case 