Sustainable is derived from Sustain. Carry is a type of Sustain. Carry is a different concept from Drop. Drop is related to Direction. 
Doll is related to Stuff. 
Sustainable --DerivedFrom--> Sustain <--IsA-- Carry <--DistinctFrom--> Drop <--RelatedTo--> Direction 
Doll <--RelatedTo--> Stuff 