In response to 'That is to say, beside Indo-European and Indo-Hittite, there must have existed an Indo-Slurvian.', does 'There must definitely not exist an Indo-Slurvian.' serve as a counterstatement?
That is to say, beside Indo-European and Indo-Hittite, there must have existed an Indo-Slurvian.###There must definitely not exist an Indo-Slurvian.