ns  delta a b c z_o z_s 
          0     +0 U U U   U   U 
          0     +1 0 0 1   U   U 
          0     +2 0 0 1   1   U 
          3     +0 0 0 1   1   1 
      20000     +0 0 1 1   1   1 
      25000     +0 1 1 1   1   1 
      28000     +0 1 1 0   1   1 
      35000     +0 0 1 0   1   1 
      35000     +2 0 1 0   0   1 
      35006     +0 0 1 0   0   0 
      38000     +0 0 1 1   0   0 
      38000     +1 0 1 1   1   0 
      38003     +0 0 1 1   1   1 
      45000     +0 1 1 1   1   1 
      48000     +0 1 1 0   1   1