Concern is related to Deep. Deep is a synonym of Fast. Fast is related to Shake. Shake is related to Working. 
Medical is related to Doctor. Doctor is related to Guy. Guy is related to Cool. 
Concern <--RelatedTo--> Deep <--Synonym--> Fast <--RelatedTo--> Shake <--RelatedTo--> Working 
Medical <--RelatedTo--> Doctor <--RelatedTo--> Guy <--RelatedTo--> Cool 