DUPN
Duplicates all items between (and including) the highlighted item and the item on stack level 1. If, for
example, you have selected the item on stack level 3, selecting DUPN duplicates it and the two items below it,
places them on stack levels 1 to 3, and moves the items that were duplicated up to stack levels 4 to 6.
Echo
Places a copy of the selected result on the entry line and leaves the source result highlighted.
44 Chapter 3 Reverse Polish Notation (RPN)
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