Disease is related to Severe. Severe is related to Pain. 
Deal is related to Play. Play is related to Debut. Debut is a type of Introduce. Introduce is related to Social. 
Disease <--RelatedTo--> Severe <--RelatedTo--> Pain 
Deal <--RelatedTo--> Play <--RelatedTo--> Debut --IsA--> Introduce <--RelatedTo--> Social 