   From  :    To
         :   3700000   3400000   2700000   2300000   1800000 
  3700000:         0        15        23        13        33 
  3400000:        28         0       310       144        65 
  2700000:        24       288         0       271       228 
  2300000:        10       148       269         0       594 
  1800000:        21        96       210       593         0 
