you are likely to find Sugar in/at/on Jar. Jar is a type of Container. you are likely to find Fluid in/at/on Container. Fluid is related to Sweat. 
Public is related to Road. Road is related to Railroad. 
Sugar --AtLocation--> Jar --IsA--> Container <--AtLocation-- Fluid <--RelatedTo--> Sweat 
Public <--RelatedTo--> Road <--RelatedTo--> Railroad 