Drama is related to Serious. Serious is related to Disease. Disease is related to Medical. Medical is related to Nurse. 
Housing is related to Interest. Interest is related to Specialist. 
Drama <--RelatedTo--> Serious <--RelatedTo--> Disease <--RelatedTo--> Medical <--RelatedTo--> Nurse 
Housing <--RelatedTo--> Interest <--RelatedTo--> Specialist 