country?, numberOfCharacters?, date?, likes?, retweets?, comments?)>
                  
                  
                  <!ELEMENT username(#PCDATA)>
                  
                  
                  <!ELEMENT tweetNumber(#PCDATA)>
                  
                  
                  <!ELEMENT cuntry(#PCDATA)>
                  
                  
                  <!ELEMENT numberOfCharacters(#PCDATA)>
                  
                  
                  <!ELEMENT date(#PCDATA)>
                  
                  
                  <!ELEMENT likes(#PCDATA)>
                  
                  
                  <!ELEMENT retweets(#PCDATA)>
                  
                  
                  <!ELEMENT comments(#PCDATA)>
                  
                  
                
I believe there is a shell command to verify correctness
You may try to take the * inside the (), not outside
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