Cave is a type of Explore. Explore is a synonym of Examine. 
Clear is related to Salt. you are likely to find Salt in/at/on Mine. Mine is related to Deadly. Deadly is related to War. 
Cave --IsA--> Explore <--Synonym--> Examine 
Clear <--RelatedTo--> Salt --AtLocation--> Mine <--RelatedTo--> Deadly <--RelatedTo--> War 