Core is related to Fruit. Fruit is related to Grow. Grow is related to Farmer. Farmer is related to Harm. 
Observer is a type of Expert. Observation is derived from Observer. 
Core <--RelatedTo--> Fruit <--RelatedTo--> Grow <--RelatedTo--> Farmer <--RelatedTo--> Harm 
Expert <--IsA-- Observer <--DerivedFrom-- Observation 