Lektion 1 bis 20

   1    2                      
                         
 3     4                  5       
                         
6                           
          7     8              
                 9          
10            11                 
            12               
13     14                        
         15                  
16    17                         
               18     19         
20                21         22      
                         
   23                 24         
           25                
  26                    27       
           28                
 29          30                  
           31                
32       33                      
                         
       34