Teaching is related to Punishment. Killing can cause/lead to Punishment. Killing requires Rage. 
Lemon is related to Taste. Taste is a type of Discrimination. Discrimination is the opposite of Equality. 
Teaching <--RelatedTo--> Punishment <--Causes-- Killing --HasPrerequisite--> Rage 
Lemon <--RelatedTo--> Taste --IsA--> Discrimination <--Antonym--> Equality 