Element #0
0: 8 14 9 18 0 19 11 16 12 1 2 3
Element #1
0: 9 15 10 19 4 20 12 17 13 5 6 7
========= Face restriction; marker: 4 ========
num_elem: 1, elem_size: 3, num_dof:  21
0: 11 18 8
========= Face restriction; marker: 2 ========
num_elem: 1, elem_size: 3, num_dof:  21
0: 10 20 13
========= Face restriction; marker: 1 ========
num_elem: 2, elem_size: 3, num_dof:  21
0: 8 14 9
0: 9 15 10
========= Face restriction; marker: 3 ========
num_elem: 2, elem_size: 3, num_dof:  21
0: 12 16 11
0: 13 17 12