Screen is a type of Analyze. Trace is a type of Analyze. Trace is a type of Detect. 
Cat requires Meat. Cat is related to Big. Big is related to Sigh. Sigh is related to Night. 
Screen --IsA--> Analyze <--IsA-- Trace --IsA--> Detect 
Meat <--HasPrerequisite-- Cat <--RelatedTo--> Big <--RelatedTo--> Sigh <--RelatedTo--> Night 