Play is related to Learning. Learning is related to Teaching. Piano can be used for Teaching. Piano is related to Grand. 
Seller is related to Trade. Trade is a type of Sell. Sell is a type of Persuade. 
Play <--RelatedTo--> Learning <--RelatedTo--> Teaching <--UsedFor-- Piano <--RelatedTo--> Grand 
Seller <--RelatedTo--> Trade --IsA--> Sell --IsA--> Persuade 