*HEADING
EC34SHE1: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [C3D4H]
*PREPRINT,ECHO=YES,HISTORY=YES,MODEL=YES
*NODE
 1, 0.0, 0.0, 0.0
 2, 2.0, 0.0, 0.0
 3, 2.0, 2.0, 0.0
 4, 0.0, 2.0, 0.0
 5, 0.0, 0.0, 1.0
 6, 2.0, 0.0, 1.0
 7, 2.0, 2.0, 1.0
 8, 0.0, 2.0, 1.0
*ELEMENT,TYPE=C3D4H, ELSET=EALL
 1, 1,2,3,6
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*MATERIAL,NAME=A1
*ELASTIC
 3.E6,0.3
*DENSITY
7.5E-4, 
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
9, , ,-1.E6 
*END STEP