diff --git a/interp/grid/DD.py b/interp/grid/DD.py
index ae88b4b..669155b 100644
--- a/interp/grid/DD.py
+++ b/interp/grid/DD.py
@@ -1,6 +1,8 @@
 from interp.grid.delaunay import dgrid as basegrid
 from interp.tools import baker_exact_2D as exact_func
 
+from itertools import product
+
 import numpy as np
 
 class rect_grid(basegrid):
@@ -29,15 +31,12 @@ class rect_grid(basegrid):
 
 class random_grid(rect_grid):
   def __init__(self, num_verts = 10):
-    verts = []
 
     appx_side_res = int(np.sqrt(num_verts))
     delta = 1.0 / float(appx_side_res)
 
-    verts.append([0,0])
-    verts.append([1,0])
-    verts.append([0,1])
-    verts.append([1,1])
+    # load up corners:
+    verts = [i for i in product((0,1), repeat = 2)]
 
     for x in xrange(1,appx_side_res):
       cur_x = x * delta