Mapping into two lists

[Marcus Stojek]

In article <9mvmqr03kq at enews2.newsguy.com>, aleax at aleax.it says...
> that the sorted input list itself is non-empty?  It's
> hard to gather PRECISE specs from such a succint way
> of presenting things, but, let's assume I guessed:-).
you did ;-)

now when i see it its perfectly clear. You have to use three marks
(current,currlas and item). I used only two what makes things a little
bit more complicated. I will try this strange sentinel thing in a couple
of years.

Thank you.
Marcus