Does 'That is to say, beside Indo-European and Indo-Hittite, there must have existed an Indo-Slurvian.' serve to directly refute the premise presented in 'There must have existed an Indo-Slurvian.'
That is to say, beside Indo-European and Indo-Hittite, there must have existed an Indo-Slurvian.###There must have existed an Indo-Slurvian.