Rubber is related to Tube. Tube is a type of Supply. Coal is a type of Supply. 
Shell is related to Beach. you are likely to find Ball in/at/on Beach. Ball is related to Golf. 
Rubber <--RelatedTo--> Tube --IsA--> Supply <--IsA-- Coal 
Shell <--RelatedTo--> Beach <--AtLocation-- Ball <--RelatedTo--> Golf 