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