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DGF
vertex 
parameters 1
firstindex 1
 0   0  5   5   # 1
 0   0  0   0   # 2
 0 -10  0 -10   # 3 
 0 -10 10   0   # 4 
 0  10 10  20   # 5 
 0  10  5  15   # 6 

30  10  0   40 # 7 
30 -10  0   20 # 8 
30 -10 10   30 # 9 
30  10 10   50 # 10 

25  10  0   35 # 11 
25   0  0   25 # 12 
25   0  5   30 # 13 
25  10  5   40 # 14 

0    0 10   10 # 15 

30   0  0   30 # 16
30   0  5   35 # 17
30   0 10   40 # 18
30  10  5   45 # 19
30 -10  5   25 # 20

25  10 10   45 # 21
25   0 10   35 # 22
25 -10 10   25 # 23
25 -10  5   20 # 24 
25 -10  0   15 # 25

0  -10  5   -5 # 26
#
Cube
map 0 1 3 2  4 5 7 6
21 14 13 22  5  6  1 15 
23 22 13 24  4 15  1 26 
25 24 13 12  3 26  1  2 
17 19 7 16  13 14 11 12 
17 16 8 20  13 12 25 24 
17 20 9 18  13 24 23 22 
17 18 10 19 13 22 21 14 
#
boundarysegments
2   1 2 3 26
2   26 4 15 1
2   1 15 5 6

1   7 16 17 19
1   19 17 18 10
1   8 16 17 20
1   20 17 18 9

4   21 10 19 14 
4   11 7 19 14
4   5 6 14 21

4   15 5 22 21 
4   4 15 22 23
4   23 9 18 22
4   22 18 10 21
# 
boundarydomain
default 3 
#
# examplegrid10b.dgf