Solid is related to Butter. you are likely to find Butter in/at/on Restaurant. you are likely to find Plate in/at/on Restaurant. 
Main is related to Road. you are likely to find Bus in/at/on Road. Bus is part of Fleet. 
Solid <--RelatedTo--> Butter --AtLocation--> Restaurant <--AtLocation-- Plate 
Main <--RelatedTo--> Road <--AtLocation-- Bus --PartOf--> Fleet 