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Cardboard
Card | 
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      One of a set of 52 small rectangular pieces of stiff paper each with a number and one of four signs printed on it, used in games  | 
    
Board | 
      ![]()  | 
      A thin flat piece of cut wood or other hard material.  | 
    
Card + Board | 
    ||
Cardboard | 
      ![]()  | 
      Material like very thick stiff paper, usually pale brown in colour, which is used especially for making boxes.  | 
    
Example Sentence:-
"I love getting post, especially when it comes in a cardboard box."
English Vocabulary
                                    

