Closer is related to Near. Near is similar to Artificial. Artificial is related to Doll. 
Virus can cause/lead to Infection. Aids is a type of Virus. Aids is related to Hear. 
Closer <--RelatedTo--> Near <--SimilarTo--> Artificial <--RelatedTo--> Doll 
Infection <--Causes-- Virus <--IsA-- Aids <--RelatedTo--> Hear 