Thanks for posting that Detlef.
Yes, this book entry may be some evidence that we're looking at a true Sulawesi origin, but as you are probably aware, this book is not what we could call a particularly reliable source. I don't have it with me at the moment, I lent it to a friend to have a look at, I'd like to see what the text says about this form, if indeed it says anything.
However, its a step in the right direction.
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