Protocol is related to Proper. Proper is related to Name. Name is related to Bill. 
Buyer is derived from Buy. Buy is related to Acquire. Acquire is related to Learn. 
Protocol <--RelatedTo--> Proper <--RelatedTo--> Name <--RelatedTo--> Bill 
Buyer --DerivedFrom--> Buy <--RelatedTo--> Acquire <--RelatedTo--> Learn 