Dance is related to Slide. Slide is related to Ground. Ground is related to Tunnel. 
Class is related to Security. Peace is a type of Security. Peace is related to Earth. Earth is related to Salt. 
Dance <--RelatedTo--> Slide <--RelatedTo--> Ground <--RelatedTo--> Tunnel 
Class <--RelatedTo--> Security <--IsA-- Peace <--RelatedTo--> Earth <--RelatedTo--> Salt 