Guilt is a synonym of Regret. Regret is related to Back. 
Tour is related to Island. Island is related to Statue. Statue is related to Building. you are likely to find Wall in/at/on Building. 
Guilt <--Synonym--> Regret <--RelatedTo--> Back 
Tour <--RelatedTo--> Island <--RelatedTo--> Statue <--RelatedTo--> Building <--AtLocation-- Wall 