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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _bfreeseg function frees a based heap. The <seg> argument is a
     based heap returned by an earlier call to _bheapseg. It specifies
     the based heap to be freed.
 
     The specified segment is freed completely regardless of whether
     the blocks it contains are free or allocated. After a _bfreeseg
     call, the <seg> value is invalid and should not be used.
 
     Return Value
 
     The _bfreeseg function returns 0 if successful, or -1 in the case
     of an error.
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