--- /dev/null
+%
+% Problem dimension
+%
+NDIME= 2
+%
+% Inner element connectivity
+%
+NELEM= 8
+5 0 1 3 0
+5 1 4 3 1
+5 1 2 4 2
+5 2 5 4 3
+5 3 4 6 4
+5 4 7 6 5
+5 4 5 7 6
+5 5 8 7 7
+%
+% Node coordinates
+%
+NPOIN= 9
+0.00000000000000 0.00000000000000 0
+0.50000000000000 0.00000000000000 1
+1.00000000000000 0.00000000000000 2
+0.00000000000000 0.50000000000000 3
+0.50000000000000 0.50000000000000 4
+1.00000000000000 0.50000000000000 5
+0.00000000000000 1.00000000000000 6
+0.50000000000000 1.00000000000000 7
+1.00000000000000 1.00000000000000 8
+%
+% Boundary elements
+%
+NMARK= 4
+MARKER_TAG= lower
+MARKER_ELEMS= 2
+3 0 1
+3 1 2
+MARKER_TAG= right
+MARKER_ELEMS= 2
+3 2 5
+3 5 8
+MARKER_TAG= upper
+MARKER_ELEMS= 2
+3 8 7
+3 7 6
+MARKER_TAG= left
+MARKER_ELEMS= 2
+3 6 3
+3 3 0