Patent is a type of Change. Reduction is a type of Change. 
Tail is related to Fur. Fur can be used for Pet. Bird can Pet. Bird is related to Swallow. 
Patent --IsA--> Change <--IsA-- Reduction 
Tail <--RelatedTo--> Fur --UsedFor--> Pet <--CapableOf-- Bird <--RelatedTo--> Swallow 