Unusual is a synonym of Rare. Rare is related to Council. 
Break is a type of Accident. Break is related to Present. Present is related to Wrap. Wrap is a type of Sandwich. 
Unusual <--Synonym--> Rare <--RelatedTo--> Council 
Accident <--IsA-- Break <--RelatedTo--> Present <--RelatedTo--> Wrap --IsA--> Sandwich 