Salt is a type of Season. Salt is related to Foot. you are likely to find Toe in/at/on Foot. 
Mark is related to Spot. Spot is related to Wound. you are likely to find Wound in/at/on Patient. Patient is related to Client. 
Season <--IsA-- Salt <--RelatedTo--> Foot <--AtLocation-- Toe 
Mark <--RelatedTo--> Spot <--RelatedTo--> Wound --AtLocation--> Patient <--RelatedTo--> Client 