Cow is related to Producer. 
you are likely to find Sack in/at/on Office. Sack is related to Sad. you would Hug because Sad. Hug is a type of Embrace. 
Cow <--RelatedTo--> Producer 
Office <--AtLocation-- Sack <--RelatedTo--> Sad <--MotivatedByGoal-- Hug --IsA--> Embrace 