Erases the search string, replaces it with the contents of the
    buffer indicated in the /BUFFER qualifier, and finds the next
    occurrence of the string. To use this qualifier, do the following:

    1. Issue the SET SELECT_MARK command (press the SELECT key) at the
       command prompt.

    2. Type the new text in the buffer.

    3. Issue the CUT command (press the CUT or REMOVE key) at the
       command prompt. This places the text in the indicated buffer.

    4. Issue the SEARCH command (press the FIND key) at the command
       prompt, followed by the text you want to search for and
       replace.

    5. Press the ENTER key.

    6. Issue the CUT/SUBSTITUTE command (press the SUBS key) at the
       command prompt.

    Subsequently, each time you issue the CUT/SUBSTITUTE command, LSE
    makes one substitution and finds the next occurrence of the search
    string.