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Z element type 
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Why are some parts of the model missing when OSSmooth is used to recover geometry? 
Why did OptiStruct start to run, but fail after some time with a memory allocation error when I used the "-fixlen" option? 
Why do I get the error message "out of environment space"? 
Why do I still have a huge constraint violation percentage 
Why doesn't the converged optimization result I obtain contain elements with high density values (0.7 ~ 1.0)? 
XYPEAK / XYPLOT / XYPUNCH