*HEADING
ECA6SLE1: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [CAX6MH]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE
 1,1.,0.
 3,3.,0.
 7,1.,1.
 9,3.,1.
*NGEN
 1,3
 7,9
 1,7,3
 3,9,3
 4,6
*ELEMENT,TYPE=CAX6MH,ELSET=ELEMS
 1, 1,3,9,2,6,5
*SOLID SECTION,MATERIAL=A1, ELSET=ELEMS
*MATERIAL,NAME=A1
*ELASTIC,TYPE=ISOTROPIC
 3.E6,0.3
*DENSITY
7.5E-4, 
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
5, , ,-1.E7 
*MODAL FILE
*END STEP