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I would use the C. I will always give the additional letter to the inferior version. Also Calclavia's version is just called MFFS, whereas Classic (which is a remake) is known as MFFS Classic.
Um, I said they're not part of the series, they're ordered separately. This means they're part of the continuity, but not the a particular series - however they'll usually put them in a boxset.
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