Julian Mehnle wrote:
[singleton alpha]
How is that important? No need for back-tracking?
Sorry, I don't recall the details, it popped up on the general
list in a discussion about 2606bis and 1591, see the thread
near
<http://mid.gmane.org/435697F6(_dot_)3014(_at_)xyzzy(_dot_)claranet(_dot_)de>
Bye, Frank
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