Legend is a synonym of Key. you are likely to find Key in/at/on Purse. Purse is related to Doctor. Doctor is related to Nurse. 
Excuse is related to Dog. Dog does not want (to) Punishment. Punishment is related to Negative. 
Legend <--Synonym--> Key --AtLocation--> Purse <--RelatedTo--> Doctor <--RelatedTo--> Nurse 
Excuse <--RelatedTo--> Dog --NotDesires--> Punishment <--RelatedTo--> Negative 