I think there is additional information within the back runs that hasn't been fully explored either. Polar Bears, for example, don't appear in equal numbers...if they are in the group of 22 that appear with only 5 backs, then they are very tough in the polar bear group relative to other polar bears. As another example, 32 sovereigns will come with a darker green back...the same set of 32 is the entire group american beauty blacks (that is...if it has an american beauty black, then it has a dull green sovereign).
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