Worth is related to Value. Value is related to Medal. 
Desk is related to Reading. one thing you do when you Study is Reading. Study can cause/lead to Knowledge. Knowledge is related to Know. 
Worth <--RelatedTo--> Value <--RelatedTo--> Medal 
Desk <--RelatedTo--> Reading <--HasSubevent-- Study --Causes--> Knowledge <--RelatedTo--> Know 