Angry is similar to Black. Black is related to Bat. Bat is a type of Animal. Animal is related to Discovery. 
Reason is related to Brain. Brain is related to Invention. Invention is related to Idea. 
Angry <--SimilarTo--> Black <--RelatedTo--> Bat --IsA--> Animal <--RelatedTo--> Discovery 
Reason <--RelatedTo--> Brain <--RelatedTo--> Invention <--RelatedTo--> Idea 