Panel is a type of Sheet. Sheet can be Smooth. Smooth is related to Bullet. Bullet is related to Ball. 
you are likely to find Foot in/at/on Table. Table is related to Chair. Arm is part of Chair. 
Panel --IsA--> Sheet --HasProperty--> Smooth <--RelatedTo--> Bullet <--RelatedTo--> Ball 
Foot --AtLocation--> Table <--RelatedTo--> Chair <--PartOf-- Arm 