you are likely to find Envelope in/at/on Drawer. you are likely to find Bill in/at/on Envelope. Bill is related to Ticket. 
Confusion is related to Understanding. Understanding is related to Care. Care is related to Health. Health is related to System. 
Drawer <--AtLocation-- Envelope <--AtLocation-- Bill <--RelatedTo--> Ticket 
Confusion <--RelatedTo--> Understanding <--RelatedTo--> Care <--RelatedTo--> Health <--RelatedTo--> System 