Situation is related to Danger. Danger is related to Sudden. 
Ticket is a type of Book. Ticket is a synonym of Label. Label is a type of Marker. Marker is related to Hazard. 
Situation <--RelatedTo--> Danger <--RelatedTo--> Sudden 
Book <--IsA-- Ticket <--Synonym--> Label --IsA--> Marker <--RelatedTo--> Hazard 