Procedure ShiftUp;

    This shifts up the  entire  list  (increasing  the  size  by 1).  The
    current item is thus duplicated into the next item.

    Example

    If the current item is  6  and  there  are  8  items in the list, the
    list size becomes 9, item 9  becomes  item  8, item 8 becomes item 7,
    item 7 becomes item 6 and item 6 remains as is.