Revert "renamed a method variable"

This reverts commit 8193ddeea8.

trees_and_tents.py

@@ -69,12 +69,12 @@ def get_possible_tents_in_row(row):
     return possible_tent_positions
 
 def get_neighbours(i, j):
-    cells = []
+    cs = []
     for p in range(max(i-1, 0), min(i+2, size_y)):
         for q in range(max(j-1, 0), min(j+2, size_x)):
             if p == i and q == j: continue
-            cells.append(cells[p][q])
-    return cells
+            cs.append(cells[p][q])
+    return cs
 
 def get_tree_neighbours(i, j):
     tree_pos = []