Missing is related to Division. Division is related to Degree. 
Chemical is related to Oxygen. Oxygen is related to Ingredient. Ingredient is related to Page. Page is related to Column. 
Missing <--RelatedTo--> Division <--RelatedTo--> Degree 
Chemical <--RelatedTo--> Oxygen <--RelatedTo--> Ingredient <--RelatedTo--> Page <--RelatedTo--> Column 