Arrow is related to Line. Boundary is a type of Line. Boundary is related to District. District is related to Market. 
Liquid is related to Bucket. Bucket have Handle. Handle is related to Grab. one thing you do when you Climb is Grab. 
Arrow <--RelatedTo--> Line <--IsA-- Boundary <--RelatedTo--> District <--RelatedTo--> Market 
Liquid <--RelatedTo--> Bucket --HasA--> Handle <--RelatedTo--> Grab <--HasSubevent-- Climb 