Challenge is a type of Situation. Challenge would make you want to Compete. 
you are likely to find Feather in/at/on Bird. you are likely to find Bird in/at/on Garden. Garden is related to Land. Land is related to Rural. 
Situation <--IsA-- Challenge --CausesDesire--> Compete 
Feather --AtLocation--> Bird --AtLocation--> Garden <--RelatedTo--> Land <--RelatedTo--> Rural 