*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [SAXA23]
*NODE,NSET=NALL
 1, 5., 2.
 2, 5., 7.
 3, 5., 12.
*ELEMENT,TYPE=SAXA23, ELSET=EALL
 1, 1,2,3
*SHELL SECTION,MATERIAL=MAT1, ELSET=EALL
 .1, 3
*MATERIAL,NAME=MAT1
*ELASTIC
 30.E6, .3
*DENSITY
7.5E-4, 
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
10, , ,-1.E3 
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP