3 3 7 1
  1 1 1.1
  2 1 2.1
  3 1 1e-30
  2 2 2.2
  3 2 3.2
  2 3 2.3
  3 3 3.3
  1
  2
  3
     -1.09999999999998876454e-01
     -1.09999999999998876454e-01