Homework can cause/lead to Frustration. Homework is related to Report. Report is related to Result. Result is related to Pain. 
Idea is related to Deer. Deer is related to Ear. 
Frustration <--Causes-- Homework <--RelatedTo--> Report <--RelatedTo--> Result <--RelatedTo--> Pain 
Idea <--RelatedTo--> Deer <--RelatedTo--> Ear 