Always wondered, never asked: is the vi in lower case to indicate that it's minor? If so, what do you do with the VII since it's actually diminished? You could "wing it" a bit with a minor, though, I suppose.
Right, the lower case is minor. For the dim seventh, you'd write viiº. In many contexts if you want the seventh in the bass it's more common to use a V chord in first inversion instead (e.g. A/C# in the key of D), depending on how you want to resolve it.
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