*HEADING
: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED MESH  [SPRINGA, anisotropic MASS]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE
 1, 0., 0.
 2, 1., 0.
 3, 2., 0.
*ELEMENT,TYPE=SPRINGA,ELSET=SPRINGS
 1, 1,2
 2, 2,3
 3, 1,3
*ELEMENT,TYPE=MASS,ELSET=M1
 101, 2
*ELEMENT,TYPE=MASS,ELSET=M2
 102, 3
*SPRING,ELSET=SPRINGS
 1, 
 1.0, 
*MASS,ELSET=M1,TYPE=ANISOTROPIC
 1.0,2.0,3.0
*MASS,ELSET=M2,TYPE=ANISOTROPIC
 2.0,3.0,4.0 
*BOUNDARY
 1,1,3
*STEP
*FREQUENCY, eigensolver=lanczos, SIM=NO
 8, , ,-1. 
*OUTPUT,HISTORY,FREQUENCY=1
*MODAL OUTPUT
*END STEP