Circuit is related to Board. you are likely to find Nail in/at/on Board. Root is part of Nail. you are likely to find Root in/at/on Tree. 
Lion is a type of Person. Reader is a type of Person. 
Circuit <--RelatedTo--> Board <--AtLocation-- Nail <--PartOf-- Root --AtLocation--> Tree 
Lion --IsA--> Person <--IsA-- Reader 