After 1. su 2. sarva and 3. ardha the first vowel of the name of a country gets the vṛddhi when a taddhita affix with an indicatory ñ , ṇ or k follows.,
As सुपाञ्चालकः, सर्वपाञ्चालकः and अर्धपाञ्चालकः, formed with वुञ् 4.2.125. This sutra also gives rise to the following rule सुसर्वार्धदिक् शब्देभ्यो जनपदस्य \The tadantavidhi applies to words denoting country, when the first member is सु, सर्व, अर्ध or a direction-denoting word\. As shown in the above examples, and for direction denoting words see the following sutra ((1. 1. 72) Vartika Malabhashya).,