Column is related to Term. Term is related to Mass. Mass is related to Event. Shortage is a type of Event. 
Troubled is related to Concerned. Concerned is similar to Afraid. Afraid is etymologically related to Free. Human can be Free. 
Column <--RelatedTo--> Term <--RelatedTo--> Mass <--RelatedTo--> Event <--IsA-- Shortage 
Troubled <--RelatedTo--> Concerned <--SimilarTo--> Afraid --EtymologicallyRelatedTo--> Free <--HasProperty-- Human 