Sauce is related to Pasta. Pasta is related to Egg. Cake is made of Egg. Cake is related to Essential. 
Police is a synonym of Pig. Pig is a synonym of Policeman. you are likely to find Policeman in/at/on Street. Street is related to Black. 
Sauce <--RelatedTo--> Pasta <--RelatedTo--> Egg <--MadeOf-- Cake <--RelatedTo--> Essential 
Police <--Synonym--> Pig <--Synonym--> Policeman --AtLocation--> Street <--RelatedTo--> Black 