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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _hfree function deallocates a memory block; the freed memory
     is returned to the operating system. The <memblock> argument
     points to a memory block previously allocated through a call to
     _halloc. The number of bytes freed is the number of bytes
     specified when the block was allocated.
 
     Note that attempting to free an invalid <memblock> argument (one
     not allocated with _halloc) may affect subsequent allocation and
     cause errors.
 
     Return Value
 
     None.
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