*HEADING
EC3RSHEE: EIGENVALUE ANALYSIS OF AN UNCONSTRAINED 1-ELEMENT MESH  [C3D27H]
*PREPRINT,ECHO=YES,HISTORY=NO,MODEL=NO
*NODE
1    , 0.        , 0.        , 0.
3    , 7.        , 0.        , 0.
19   , 0.        , 7.        , 0.
21   , 7.        , 7.        , 0.
7    , 0.        , 0.        , -7.
9    , 7.        , 0.        , -7.
25   , 0.        , 7.        , -7.
27   , 7.        , 7.        , -7.
*NGEN,NSET=ALL
1    , 3
1    , 7    , 3
3    , 9    , 3
4,6
7    , 9
1    , 19   , 9
3    , 21   , 9
7    , 25   , 9
9    , 27   , 9
10,16,3
12,18,3
10,12
13,15
16,18
19   , 25   , 3
21   , 27   , 3
19   , 21
25   , 27
22,24
*ELEMENT,TYPE=C3D27H, ELSET=EALL
1,  1,3,9,7,19,21,27,25,2,6,8,4,20,24,26,
     22,10,12,18,16,14,5,23,11,15
*SOLID SECTION,MATERIAL=A1, ELSET=EALL
*MATERIAL,NAME=A1
*ELASTIC
 3.E6,0.3
*DENSITY
7.5E-4, 
*STEP
*FREQUENCY, eigensolver=lanczos
9, , ,-1.E7
*OUTPUT,FIELD
*MODAL OUTPUT
*END STEP