Accept is a synonym of Admit. Admit is related to Confession. Confession is a type of Document. Source is a type of Document. 
Understand is related to Learn. one thing you do when you College is Learn. 
Accept <--Synonym--> Admit <--RelatedTo--> Confession --IsA--> Document <--IsA-- Source 
Understand <--RelatedTo--> Learn <--HasSubevent-- College 