Lesson is related to Art. Art is related to Technique. Technique is related to Division. 
Retain is a type of Keep. Retain is a type of Remember. Recognize is a type of Remember. Recognize is a synonym of Distinguish. 
Lesson <--RelatedTo--> Art <--RelatedTo--> Technique <--RelatedTo--> Division 
Keep <--IsA-- Retain --IsA--> Remember <--IsA-- Recognize <--Synonym--> Distinguish 