you are likely to find Turkey in/at/on Refrigerator. you are likely to find Fruit in/at/on Refrigerator. Fruit can be used for Eating. Wheat can be used for Eating. 
Equation is related to Result. Result is related to Lose. Lose is related to Weight. 
Turkey --AtLocation--> Refrigerator <--AtLocation-- Fruit --UsedFor--> Eating <--UsedFor-- Wheat 
Equation <--RelatedTo--> Result <--RelatedTo--> Lose <--RelatedTo--> Weight 