/DUPLICATION=specifier
       /DUPLICATION=CONTEXT_DEPENDENT (D)

    Specifies the type of duplication to be performed when the
    placeholder is duplicated (either by expanding it or by typing
    over it). The specifier is one of the following keywords:

    o  CONTEXT_DEPENDENT

       If the placeholder is the only item within its segment (that
       is, if it is either the only item before or the only item
       within a trailing comment), then LSE duplicates it vertically
       (see the VERTICAL keyword in this list). Otherwise, LSE
       duplicates it horizontally. White space may precede or follow
       the placeholder.

    o  HORIZONTAL

       LSE places the duplicate immediately to the right of the
       original. If you specify a separation string, LSE places the
       string between the original and the duplicate.

    o  VERTICAL

       LSE places the duplicate on the next line, immediately under
       the original. If a separation string is specified, LSE places
       it at the end of the original. If the original placeholder is
       in the commented segment of the line, then LSE also duplicates
       the comment delimiters directly underneath the delimiters
       in the original line. If necessary, LSE adds close comment
       delimiters to the original line to close a bracketed comment on
       that line.