*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [SAXA24]
*NODE,NSET=NALL
*ELEMENT,TYPE=SAXA24, ELSET=EALL
*SHELL SECTION,MATERIAL=MAT1, ELSET=EALL
 .1, 3
*MATERIAL,NAME=MAT1
*ELASTIC
 30.E6, .3
*DENSITY
7.5E-4,
*STEP
*FREQUENCY, eigensolver=lanczos
10, , ,-1.E3
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP