*include, input=substr_multi_nodes.inp
*Element, type=CPE4,elset=cpe
 1,  1,  2,  7,  6
 2,  2,  3,  8,  7
 3,  3,  4,  9,  8
 4,  4,  5, 10,  9
 5,  6,  7, 12, 11
 6,  7,  8, 13, 12
 7,  8,  9, 14, 13
 8,  9, 10, 15, 14
 9, 11, 12, 17, 16
10, 12, 13, 18, 17
11, 13, 14, 19, 18
12, 14, 15, 20, 19
13, 16, 17, 22, 21
14, 17, 18, 23, 22
15, 18, 19, 24, 23
16, 19, 20, 25, 24
*Solid Section, elset=cpe, material=Elas
1.,
*Material, name=Elas
*Density
70.,
*Elastic
 1e+08,0.
************************
*element,type=spring1,elset=spr
20002,25
*spring,elset=spr
2,
1000,
** ----------------------------------------------------------------
*Step, name=Stp1, nlgeom, inc=1000
Small deformation
*Static, direct
0.1, 1.,0.1,0.1 
*controls,param=field
1.e-8,
** 
*boundary
5,1,2
*Cload
21, 2, 500.
*Output, field
*node output
u,
*End Step