#vertex 
20
0  0  0
1  0  0
2  0  0
0  1  0
1  1  0
2  1  0
0  2  0
1  2  0
0  0  1
1  0  1
2  0  1
0  1  1
1  1  1
2  1  1
0  2  1
1  2  1
0  1  3
1  1  3
0  2  3
1  2  3
#element_face
18
0	3	4	1
1	4	5	2
3	6	7	4
8	9	12	11
9	10	13	12
16	17	19	18
0	8	11	3
3	11	14	6
11	16	18	14
4	12	15	7
12	17	19	15
2	10	13	5
0	1	9	8
1	2	10	9
11	12	17	16
4	5	13	12
6	7	15	14
14	15	19	18