Mark is related to Note. Note is related to Frequency. Frequency is a type of Ratio. Efficiency is a type of Ratio. 
Hat is related to Habit. Habit is related to Break. Break is related to Period. Period is related to Pain. 
Mark <--RelatedTo--> Note <--RelatedTo--> Frequency --IsA--> Ratio <--IsA-- Efficiency 
Hat <--RelatedTo--> Habit <--RelatedTo--> Break <--RelatedTo--> Period <--RelatedTo--> Pain 