*include, input=substr_multi_nodes.inp
*Element, type=CPE4,elset=cpe
 3,  3,  4,  9,  8
 4,  4,  5, 10,  9
 7,  8,  9, 14, 13
 8,  9, 10, 15, 14
*Solid Section, elset=cpe, material=Elas
1.,
*Material, name=Elas
*Density
70.,
*Elastic
 1e+08,0.
************************
*STEP
*substructure generate, type=z1, overwrite,
recovery matrix=yes, mass matrix=yes,
libr=lib1
*RETAINED NODAL DOFS,sorted=no
5,1,2
15,1,2
13,1,2
3,1,2
*substructure matrix output, stiffness=yes, 
mass=yes, recovery=yes, file=LibMatrices
*END STEP