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  Description:  Release Memory Block
 
  Releases a memory block and makes it available for use by other programs.
 
  Input                                Output
  ═════════════════════════            ════════════════════════
  AH=49H                               If function successful
  ES=segment of block to be            Carry flag=clear
     released                          If function unsuccessful
                                       Carry flag=set
                                       AX=error code
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