ns  delta a b z_o z_s x_o x_s 
          0     +0 U U   U   U   U   U 
          0     +1 0 0   1   U   U   U 
          0     +2 0 0   1   U   0   0 
          5     +0 0 0   1   1   0   0 
      20000     +0 0 1   1   1   0   0 
      20000     +1 0 1   0   1   1   1 
      20005     +0 0 1   0   0   1   1 
      25000     +0 1 1   0   0   1   1 
      25000     +1 1 1   1   0   1   1 
      25005     +0 1 1   1   1   1   1 
      35000     +0 0 1   1   1   1   1 
      35000     +1 0 1   0   1   1   1 
      35005     +0 0 1   0   0   1   1 
      45000     +0 1 1   0   0   1   1 
      45000     +1 1 1   1   0   1   1 
      45005     +0 1 1   1   1   1   1