Possess is related to Keep. Keep is related to Possession. Possession is related to Trade. 
Storage is related to Refrigerator. you are likely to find Milk in/at/on Refrigerator. Milk is related to Water. 
Possess <--RelatedTo--> Keep <--RelatedTo--> Possession <--RelatedTo--> Trade 
Storage <--RelatedTo--> Refrigerator <--AtLocation-- Milk <--RelatedTo--> Water 