*HEADING
EC36SFE1: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [C3D6]
*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=C3D6, 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