Whale is related to Creature. Creature is related to Size. Size is related to Shoe. you are likely to find Shoe in/at/on House. 
Sad is related to Separation. Separation is derived from Separate. 
Whale <--RelatedTo--> Creature <--RelatedTo--> Size <--RelatedTo--> Shoe --AtLocation--> House 
Sad <--RelatedTo--> Separation --DerivedFrom--> Separate 