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     C/FORTRAN Run-Time Error R6018
 
     unexpected heap error
 
     The program encountered an unexpected error while performing a
     memory-management operation.
 
     This error usually occurs if the program inadvertently alters the
     run-time heap data. However, it can also be caused by an internal
     error in the run-time or operating-system code.
 
     If your compiler provides a library containing _heapchk and
     _heapwalk, you can use these functions to diagnose this error.
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