Courtroom is a synonym of Court. Court is related to Game. Game is a synonym of Line. Line is a synonym of String. 
Tube is related to Rubber. you are likely to find Rubber in/at/on Cabinet. Cabinet is a synonym of Study. Study is related to Observe. 
Courtroom <--Synonym--> Court <--RelatedTo--> Game <--Synonym--> Line <--Synonym--> String 
Tube <--RelatedTo--> Rubber --AtLocation--> Cabinet <--Synonym--> Study <--RelatedTo--> Observe 