Field is related to Fence. Fence is related to Board. Board is related to Unit. Unit is related to Money. 
Exercise is related to Working. Working can cause/lead to Fatigue. Thinking can cause/lead to Fatigue. Thinking can be used for Fun. 
Field <--RelatedTo--> Fence <--RelatedTo--> Board <--RelatedTo--> Unit <--RelatedTo--> Money 
Exercise <--RelatedTo--> Working --Causes--> Fatigue <--Causes-- Thinking --UsedFor--> Fun 