Limit is related to Rule. Rule is related to Concept. Scheme is a type of Concept. 
Bar is related to Strip. Strip is a type of Smooth. Smooth is related to Compound. 
Limit <--RelatedTo--> Rule <--RelatedTo--> Concept <--IsA-- Scheme 
Bar <--RelatedTo--> Strip --IsA--> Smooth <--RelatedTo--> Compound 