Sheep is related to Milk. Milk is related to Fluid. 
Description is related to Unit. Unit is related to Number. Number is related to Cost. Cost is the opposite of Revenue. 
Sheep <--RelatedTo--> Milk <--RelatedTo--> Fluid 
Description <--RelatedTo--> Unit <--RelatedTo--> Number <--RelatedTo--> Cost <--Antonym--> Revenue 