World is related to Human. Human is related to Neck. Neck is related to Area. Retreat is a type of Area. 
Silly is related to Laugh. Laugh is related to Straw. Straw is related to Rabbit. 
World <--RelatedTo--> Human <--RelatedTo--> Neck <--RelatedTo--> Area <--IsA-- Retreat 
Silly <--RelatedTo--> Laugh <--RelatedTo--> Straw <--RelatedTo--> Rabbit 