Reward is a type of Transfer. Reward is related to Value. 
Time is related to Dark. Room can be Dark. you are likely to find Carpet in/at/on Room. you are likely to find Carpet in/at/on Store. 
Transfer <--IsA-- Reward <--RelatedTo--> Value 
Time <--RelatedTo--> Dark <--HasProperty-- Room <--AtLocation-- Carpet --AtLocation--> Store 