   From  :    To
         :   3700000   3400000   2700000   2300000   1800000 
  3700000:         0        24        28        23        47 
  3400000:        36         0       349       178        91 
  2700000:        25       346         0       334       221 
  2300000:        11       168       330         0       597 
  1800000:        49       116       219       572         0 
