Hi Martin,

Seeing my response in print it looks a bit terse - I must have been
associating with Harlan too much <g

I did not mean to put your formula down, I was just in a bit of a rush
when I wrote it. Your formula does satisfy the OP's requirements as
stated with no double digit numbers given.

My apologies, it was not meant that way.


Aren't you supposed to be a "dour" Scot? <vbg


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Regards,


Peo Sjoblom