I have a question regarding the letters assigned to variants in the Core. It looks live most titles with variants use a single alphabetical sequence - Cover A, B, C, etc. I see that some companies like to group covers together with the same letter for variants with the same art, and an additional letter or letters for the type of variant. For instance, A for standard, AV for Virgin variant of the A cover, AN for Naughty variant of the A cover, etc.
Should we use the publisher’s lettering scheme in these cases, or stick to the single sequence?