Does the connection between 'That is to say, beside Indo-European and Indo-Hittite, there must have existed an Indo-Slurvian.' and 'There must have existed an Indo-Slurvian.' lack any definitive logical relationship?
That is to say, beside Indo-European and Indo-Hittite, there must have existed an Indo-Slurvian.###There must have existed an Indo-Slurvian.