Alarm is related to Sound. Sound is related to Barrier. 
Serving is related to Piece. Piece is related to Article. Article is related to Writing. Writing is related to Result. 
Alarm <--RelatedTo--> Sound <--RelatedTo--> Barrier 
Serving <--RelatedTo--> Piece <--RelatedTo--> Article <--RelatedTo--> Writing <--RelatedTo--> Result 