you are likely to find Milk in/at/on Container. Pitcher is a type of Container. Pitcher is made of Clay. 
River is related to Running. Running is related to Ready. Ready is similar to Available. Available is a synonym of Valid. 
Milk --AtLocation--> Container <--IsA-- Pitcher --MadeOf--> Clay 
River <--RelatedTo--> Running <--RelatedTo--> Ready <--SimilarTo--> Available <--Synonym--> Valid 