Divide the diagram into four parts of equal size and shape, each part of which must contain the numbers 1,2,3 and 4. The four parts should then be rearranged to form a square.

       __                  
      | 1|
______|__|______ 
| 1| 3| 4| 2| 3| 
|__|__|__|__|__|
| 4| 2| 3| 4| 2|  
|__|__|__|__|__|
| 3| 1| 4| 2| 1|  
|__|__|__|__|__|