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