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▀ This function assumes that the memory block being released was pre-
  viously obtained by a successful call to Int 21H Function 48H.
 
▀ The function will fail or can cause unpredictable system errors if:
  - the program releases a memory block that does not belong to it.
  - the segment address passed in register ES is not a valid base address
    for an existing memory block.
                                    -♦-