*HEADING
EC36SHE1: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [C3D6H]
*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=C3D6H, ELSET=EALL
 1, 1,2,4,5,6,8
*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