^                                             t                               
  |                                             t  t                            
  |                              t     t     t  t  t                            
  |                              t     t  t  t  t  t  t  t                      
  |                     t     t  t  t  t  t  t  t  t  t  t  t                   
  |                     t  t  t  t  t  t  t  t  t  t  t  t  t  t                
  |                     t  t  t  t  t  t  t  t  t  t  t  t  t  t  t  t          
  |                     t  t  t  t  t  t  t  t  t  t  t  t  t  t  t  t          
  |                  t  t  t  t  t rt  t  t rt  t  t  t  t  t  t  t  t rt       
  |   t     t  t  t  t  t  t  t  t rt  t rt rt  t  t rt  t rt  t  t  t rt       
 -+---------------------------------------------------------------------------> 
  |  02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00 01