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>> ...
> That works, but if d is large, it won't be very efficient because it has
> to generate a large list.
It is not large. But I'm using Python 2.6 , not Python 3.

I did not get this error again in the last two days. I'll post a new 
reply if I encounter it again. (It happened just a few times out of many 
thousand program invocations)