Automatic is a type of Weapon. Alarm is a type of Weapon. Alarm is a type of Signal. 
Formal is related to Speech. Sentence is part of Speech. Sentence is related to Life. Life is related to Essential. 
Automatic --IsA--> Weapon <--IsA-- Alarm --IsA--> Signal 
Formal <--RelatedTo--> Speech <--PartOf-- Sentence <--RelatedTo--> Life <--RelatedTo--> Essential 