Assume I issue these instructions in `pil +` interactive mode

: (setq N 3)

: (while (gt0 n)
   (dec 'n)
   (prinl n))

It executes.  Then I want to access the second command to edit it, for
example to change the second line:
: (while (gt0 n)
   (dec 'n 2)
   (prinl n))

I press the up arrow key, but the only line that is editable is the
first one (while (gt0 n)
Is there a way to edit the second line, even though all the three
lines could be accessed as one big line, such as:
: (while (gt0 n)    (dec 'n)     (prinl n))

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