*HEADING
ECA4SIE1: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [CAX4I]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE,NSET=ALL
 1,1.,0.
 3,3.,0.
 7,1.,1.
 9,3.,1.
*ELEMENT,TYPE=CAX4I, ELSET=EALL
 1,1,3,9,7
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*MATERIAL,NAME=A1
*ELASTIC
 3.E6,0.3
*DENSITY
7.5E-4, 
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
7, , ,-1.E7 
*MODAL FILE
*END STEP