Sweater is related to Sleeve. Sleeve is related to Cover. Ridge is a type of Cover. Ridge is a type of Throw. 
Serious is related to Concern. Concern is related to Hazard. Hazard is related to Dangerous. Dangerous is related to Bear. 
Sweater <--RelatedTo--> Sleeve <--RelatedTo--> Cover <--IsA-- Ridge --IsA--> Throw 
Serious <--RelatedTo--> Concern <--RelatedTo--> Hazard <--RelatedTo--> Dangerous <--RelatedTo--> Bear 