you are likely to find Nurse in/at/on Clinic. Nurse is related to Assistant. Instrument is a type of Assistant. Instrument is related to Paper. 
Calculation is related to Division. Division is related to Line. 
Clinic <--AtLocation-- Nurse <--RelatedTo--> Assistant <--IsA-- Instrument <--RelatedTo--> Paper 
Calculation <--RelatedTo--> Division <--RelatedTo--> Line 