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>   ... the behaviour is undefined. Does this just mean
>   it may or may not include t.d during the current
>   traversal? I can live with that. Or would it produce
>   an error?
>   Thanks!
>   Vaughan

It can produce an error as well (specifically "invalid key to 'next'"). As a result this is probably not a good choice here. I do agree with the already-recommended solution of having a second table.

Good luck,
-- Matthew P. Del Buono

P.S. In the future, please avoid posting HTML. Post plaintext to the mailing list, as many people's don't read HTML and it just comes out as jibberish.