Ridge is related to Feature. Feature is related to Desert. Desert is related to Type. 
Food is related to Preparation. Preparation is related to Stretch. Stretch is related to Bend. Elbow is a type of Bend. 
Ridge <--RelatedTo--> Feature <--RelatedTo--> Desert <--RelatedTo--> Type 
Food <--RelatedTo--> Preparation <--RelatedTo--> Stretch <--RelatedTo--> Bend <--IsA-- Elbow 