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Craig WOk, the lightbulb just came on in my head! The reason T-Rex Ted did not include the Superprints as part of the 350-460 Series Sweet Cap Fact 42 OPs is because:
"Each of the six 350/460 superprints seems to have a back profile that is more or less a composite of a 350-only and a 460-only subject, rather than the back profile of a 350/460 regular print subject."