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     The _freect function tells you how much memory is available for
     dynamic memory allocation in the near heap. It does so by
     returning the approximate number of times your program can call
     _nmalloc (or malloc in small data models) to allocate an item
     <size> bytes long in the near heap (default data segment).
 
     Return Value
 
     The _freect function returns the number of calls as an unsigned
     integer.
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