DGF
Interval
0 0 0   % first corner 
1 1 1   % second corner
2 2 2  % 2 cells in x,y,z direction
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PERIODICFACETRANSFORMATION
1 0 0 , 0 1 0 , 0 0 1 + 1 0 0
1 0 0 , 0 1 0 , 0 0 1 + 0 1 0 
1 0 0 , 0 1 0 , 0 0 1 + 0 0 1 
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BOUNDARYDOMAIN
default 1    % all boundaries have id 1
#BOUNDARYDOMAIN


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