Double is related to Math. Math is related to Factor. Factor is a type of Lend. Lend is related to Aid. 
May is related to Permission. Permission is related to Do. Do is related to Learn. Learn is a synonym of Teach. 
Double <--RelatedTo--> Math <--RelatedTo--> Factor --IsA--> Lend <--RelatedTo--> Aid 
May <--RelatedTo--> Permission <--RelatedTo--> Do <--RelatedTo--> Learn <--Synonym--> Teach 