Tide is a type of Float. Tide is related to Water. you are likely to find Whale in/at/on Water. 
Banker is related to Money. Money is related to Valuable. Valuable is related to Oil. Oil is related to Iraqi. 
Float <--IsA-- Tide <--RelatedTo--> Water <--AtLocation-- Whale 
Banker <--RelatedTo--> Money <--RelatedTo--> Valuable <--RelatedTo--> Oil <--RelatedTo--> Iraqi 