Add is related to Operator. Operator is related to Captain. Captain is related to Guy. Guy is related to Cool. 
Purple is related to Grape. you are likely to find Grape in/at/on Field. Field is related to Medicine. Medicine is related to Herb. 
Add <--RelatedTo--> Operator <--RelatedTo--> Captain <--RelatedTo--> Guy <--RelatedTo--> Cool 
Purple <--RelatedTo--> Grape --AtLocation--> Field <--RelatedTo--> Medicine <--RelatedTo--> Herb 