Volume is related to Hear. Ear can Hear. Ear is related to Drink. Drink is related to Drunk. 
Count is related to Addition. Addition is related to Figure. Line is a type of Figure. Line is related to Finger. 
Volume <--RelatedTo--> Hear <--CapableOf-- Ear <--RelatedTo--> Drink <--RelatedTo--> Drunk 
Count <--RelatedTo--> Addition <--RelatedTo--> Figure <--IsA-- Line <--RelatedTo--> Finger 