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* * * W A R N I N G * * *
THE STRUCTURE IS UNSTABLE OR ILL-CONDITIONED !!
CHECK THE STRUCTURE CAREFULLY FOR:
- INADEQUATE SUPPORT CONDITIONS, OR
- ONE OR MORE INTERNAL MECHANISMS, OR
- ZERO OR NEGATIVE STIFFNESS PROPERTIES, OR
- EXTREMELY LARGE STIFFNESS PROPERTIES, OR
- BUCKLING DUE TO P-DELTA OR GEOMETRIC NONLINEARITY, OR
- A FREQUENCY SHIFT (IF ANY) ONTO A NATURAL FREQUENCY
TO OBTAIN FURTHER INFORMATION:
- USE THE STANDARD SOLVER, OR
- RUN AN EIGEN ANALYSIS USING AUTO FREQUENCY SHIFTING (WITH
   ADDITIONAL MASS IF NEEDED) AND INVESTIGATE THE MODE SHAPES
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