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					Originally Posted by Pat R  On the other hand if you're saying that they printed up a bunch of fronts one day and then used those sheets to print 3 or 4 different backs the next day and then the process started again a couple of days later I do agree with that.
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 I'm not sure how long the time would have been, but yes. Smaller orders like Drum would have been done on whatever current front sheet was being run. 
The cutoff for a brand getting their own plates or ordering  too small of a quantity is probably right around Polar Bear who had their own fronts for at least one sheet. 
I believe some of the more difficult groups and at least one of the very rare combinations are from leftover fronts being used up.