Curtain can be used for Privacy. Privacy is a synonym of Retirement. Retirement is related to Grandfather. Grandfather is a different concept from Grandmother. 
Asian is a type of American. American is related to Express. Express is related to Experiment. Experiment is related to Procedure. 
Curtain --UsedFor--> Privacy <--Synonym--> Retirement <--RelatedTo--> Grandfather <--DistinctFrom--> Grandmother 
Asian --IsA--> American <--RelatedTo--> Express <--RelatedTo--> Experiment <--RelatedTo--> Procedure 