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  Description:
 
     The routine starts at the left-hand end of string and converts
     letters to upper case (also called folding to upper case).
 
  Parameters on Entry:
 
     string                  The string to convert.
 
     length                  The number of bytes of string to change;
                             positions beyond this are unchanged.
 
  Parameters on Exit:
 
     string                  The converted string.
                                    -♦-