Medicine is related to Cure. Cure is related to Illness. Stable is a type of Illness. 
Author is a synonym of Write. Write is related to Desk. you are likely to find Foot in/at/on Desk. 
Medicine <--RelatedTo--> Cure <--RelatedTo--> Illness <--IsA-- Stable 
Author <--Synonym--> Write <--RelatedTo--> Desk <--AtLocation-- Foot 