DGF
Interval
0 0   % first corner 
1 1   % second corner
2 2   % 1 cells in x and 1 in y direction
# 

GridParameter
closure none
#

PERIODICFACETRANSFORMATION
1 0 , 0 1 + 1 0 
1 0 , 0 1 + 0 1 
#

