Level is a type of Place. Level is related to Certain. Certain is similar to Reliable. Reliable is derived from Rely. 
Syndrome is related to Fatigue. Fatigue is a type of Symptom. 
Place <--IsA-- Level <--RelatedTo--> Certain <--SimilarTo--> Reliable --DerivedFrom--> Rely 
Syndrome <--RelatedTo--> Fatigue --IsA--> Symptom 