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