tet_mesh_l2q_test, a C++ code which calls tet_mesh_l2q(), which converts a 4-node tetrahedral mesh ("tet mesh") into a 10-node tet mesh.
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tet_mesh_l2q, a C++ code which reads information about a 4-node (linear) tet mesh and creates data defining a corresponding 10-node (quadratic) tet mesh;