*DIM
 2
*NEL
 1
*NNOD
 1 72
*NODE
 1
   1  -1.00  -1.00
    18
  19   1.00  -1.00
    18
  37   1.00   1.00
    18
  55  -1.00   1.00
    18
  73  -1.00  -1.00
  0
*BOUNDARY
 1
   1   19 1 1  0.00000000  0.00000000
  37   55 0 1  0.00000000  0.00000000
   0    0 0 0  0.00000000  0.00000000
  19   33 1 1  0.00000000  0.00000000
  34   36 1 1 -1.00000000  0.00000000
  37   54 1 0  0.00000000  0.00000000
  58   72 1 1  0.00000000  0.00000000
  55   57 1 1 -1.00000000  0.00000000
   0    0 0 0  0.00000000  0.00000000
*CHECK
  1   2   3  3
0 0  0 0