Farm is related to Area. Area is related to Mall. Mall can be used for Eating. Cake can be used for Eating. 
Sector is a synonym of Industry. Industry is related to Economic. Economic is related to Trade. Trade is related to Take. 
Farm <--RelatedTo--> Area <--RelatedTo--> Mall --UsedFor--> Eating <--UsedFor-- Cake 
Sector <--Synonym--> Industry <--RelatedTo--> Economic <--RelatedTo--> Trade <--RelatedTo--> Take 