Severe is related to Pain. you are likely to find Pain in/at/on Ass. 
Rocket is a type of Herb. Herb is related to Alternative. Alternative is related to Propose. Proposed is a form of Propose. 
Severe <--RelatedTo--> Pain --AtLocation--> Ass 
Rocket --IsA--> Herb <--RelatedTo--> Alternative <--RelatedTo--> Propose <--FormOf-- Proposed 