Killing is related to Soap. Soap is related to Powder. Flour is a type of Powder. Flour is related to Dough. 
Clue is related to Hint. 
Killing <--RelatedTo--> Soap <--RelatedTo--> Powder <--IsA-- Flour <--RelatedTo--> Dough 
Clue <--RelatedTo--> Hint 