Bed can be used for Reading. Bed is related to Secret. Secret is related to Success. Passing is a type of Success. 
Lot is a different concept from Small. Small is the opposite of City. 
Reading <--UsedFor-- Bed <--RelatedTo--> Secret <--RelatedTo--> Success <--IsA-- Passing 
Lot <--DistinctFrom--> Small <--Antonym--> City 