Spill is a type of Liquid. Gasoline is a type of Liquid. Gasoline is related to Lead. Lead is a type of Strip. 
Written is related to Music. Music is related to Twist. 
Spill --IsA--> Liquid <--IsA-- Gasoline <--RelatedTo--> Lead --IsA--> Strip 
Written <--RelatedTo--> Music <--RelatedTo--> Twist 