Private is related to Garden. you are likely to find Garden in/at/on Yard. 
Source is related to Oil. Oil is related to Carbon. Carbon is related to Element. Element is related to Plot. 
Private <--RelatedTo--> Garden --AtLocation--> Yard 
Source <--RelatedTo--> Oil <--RelatedTo--> Carbon <--RelatedTo--> Element <--RelatedTo--> Plot 