Transport is related to Sail. Sail is related to Action. Application is a type of Action. 
Smoke can be Toxic. Smoke is related to Burning. Burning is a synonym of Burn. Burn is related to Accident. 
Transport <--RelatedTo--> Sail <--RelatedTo--> Action <--IsA-- Application 
Toxic <--HasProperty-- Smoke <--RelatedTo--> Burning <--Synonym--> Burn <--RelatedTo--> Accident 