Sign is related to Speed. Speed is related to Rapid. Rapid is related to Race. Race is related to Athletic. 
Extend is related to Make. Make is related to Heal. Heal is a type of Better. 
Sign <--RelatedTo--> Speed <--RelatedTo--> Rapid <--RelatedTo--> Race <--RelatedTo--> Athletic 
Extend <--RelatedTo--> Make <--RelatedTo--> Heal --IsA--> Better 