Wave is related to Salt. Salt is related to Companion. 
Set is related to Island. Island can be used for Vacation. Vacation is related to Event. Burning is a type of Event. 
Wave <--RelatedTo--> Salt <--RelatedTo--> Companion 
Set <--RelatedTo--> Island --UsedFor--> Vacation <--RelatedTo--> Event <--IsA-- Burning 