Care is related to Nice. Nice is related to Fresh. Freshman is derived from Fresh. 
Unusual is a different concept from Common. Common is related to Door. Door is related to Wooden. Wooden is related to Desk. 
Care <--RelatedTo--> Nice <--RelatedTo--> Fresh <--DerivedFrom-- Freshman 
Unusual <--DistinctFrom--> Common <--RelatedTo--> Door <--RelatedTo--> Wooden <--RelatedTo--> Desk 