sdm-order-of-operations_2D
  OPEN> models/test/sdm-order-of-operations.nlogo
  O> setup
  O> repeat 2 [ go ]
  stock => 33

sdm-dt-increment_2D
  OPEN> models/test/sdm-dt-increment.nlogo
  O> setup
  ticks => 0
  O> repeat 50 [ go ]
  ticks => 0.5
  results = "t= 0 y= 3 y-exact= 3\nt= 0.1 y= 3.3 y-exact= 3.30517\nt= 0.2 y= 3.61 y-exact= 3.6214\nt= 0.3 y= 3.931 y-exact= 3.94986\nt= 0.4 y= 4.264 y-exact= 4.29182\nt= 0.5 y= 4.611 y-exact= 4.64872\n" => true