Clay is related to Medium. Medium is related to Record. Record is related to Technology. Technology is related to Machine. 
Stair is related to Step. Step is a type of Move. Move is related to Apartment. you are likely to find Bathroom in/at/on Apartment. 
Clay <--RelatedTo--> Medium <--RelatedTo--> Record <--RelatedTo--> Technology <--RelatedTo--> Machine 
Stair <--RelatedTo--> Step --IsA--> Move <--RelatedTo--> Apartment <--AtLocation-- Bathroom 