you are likely to find Potato in/at/on Stomach. Potato is a type of Food. Egg is a type of Food. Egg is related to Inside. 
Breathing is related to Throat. Throat is related to Location. 
Stomach <--AtLocation-- Potato --IsA--> Food <--IsA-- Egg <--RelatedTo--> Inside 
Breathing <--RelatedTo--> Throat <--RelatedTo--> Location 