*HEADING
 - Adding/removing elements and verification for initial conditions
 - Test for S4R element
*IMPORT, STEP=1, UPDATE=YES, STATE=YES
 E3,
*NODE, NSET=N4
 201,0,0,0
 202,2,0,0
 203,2,2,0
 204,0,2,0
*ELEMENT, TYPE=S4R, ELSET=E4
 201,201,202,203,204
*SHELL SECTION, ELSET=E4, MATERIAL=MAT3
 0.002, 
*MATERIAL, NAME=MAT3
*HYPERELASTIC
3.2E6,0.8E6,0.001
*DENSITY
1000., 
*BOUNDARY
 N3,3,6
 N4,3,6
 201,1,2
 111,1,2
 202,2,2
 112,2,2
 204,1,1
 114,1,1
*INITIAL CONDITIONS, TYPE=VELOCITY
 SIDE_2,1,0.1
*NSET, NSET=SIDE_3
 202,203
*NSET, NSET=END
 SIDE_2, SIDE_3
*RESTART,WRITE
*STEP,NLGEOM
*DYNAMIC
0.01,0.1
*BOUNDARY, TYPE=VELOCITY
 SIDE_3,1,1,20.
*NODE FILE
 U,
*EL FILE
 LE,S
*OUTPUT, FIELD,FREQ=1
*NODE OUTPUT
 U,
*ELEMENT OUTPUT
 S,LE
*END STEP