Burden is a type of Concern. Concern is related to Crop. Crop is related to Big. Big is related to Table. 
Law is related to Bill. Bill is related to Bullet. 
Burden --IsA--> Concern <--RelatedTo--> Crop <--RelatedTo--> Big <--RelatedTo--> Table 
Law <--RelatedTo--> Bill <--RelatedTo--> Bullet 