Research can be used for Learning. Learning is related to Know. Know is related to Understanding. Understanding is related to Familiar. 
Left is related to Margin. Lip is a type of Margin. 
Research --UsedFor--> Learning <--RelatedTo--> Know <--RelatedTo--> Understanding <--RelatedTo--> Familiar 
Left <--RelatedTo--> Margin <--IsA-- Lip 