Sack is related to Container. you are likely to find Sugar in/at/on Container. you are likely to find Sugar in/at/on Coffee. 
Regret is related to Apology. Apology is derived from Apologize. 
Sack <--RelatedTo--> Container <--AtLocation-- Sugar --AtLocation--> Coffee 
Regret <--RelatedTo--> Apology --DerivedFrom--> Apologize 