Donor is related to Organ. Lens is a type of Organ. Lens is a type of Channel. 
Blend is a type of Mix. Mixed is etymologically related to Mix. Mixed is related to Alcohol. Alcohol is related to Rub. 
Donor <--RelatedTo--> Organ <--IsA-- Lens --IsA--> Channel 
Blend --IsA--> Mix <--EtymologicallyRelatedTo-- Mixed <--RelatedTo--> Alcohol <--RelatedTo--> Rub 