*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH [T2D2]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE,NSET=NALL
 1,0.
 2,2.236068,3.
*ELEMENT,TYPE=T2D2, ELSET=EALL
 1,1,2
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
 .1, 
*MATERIAL,NAME=A1
*ELASTIC
 30.E6, 
*DENSITY
7.5E-4, 
*STEP
*FREQUENCY, eigensolver=lanczos
4, , ,-1.E7 
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP