After a word denoting direction, the first vowel of the name of a country with the exception of madra gets vṛddhi before a taddhita affix having an indicatory ñ , ṇ or k ,
As पूर्वपाञ्चालकः, अपरपाञ्चालकः, दक्षिणपाञ्चालकः, उत्तरपाञ्चालकः (4.2.125, 4.2.107, 4.2.108. 6.2.105 accent). The Tadanta-vidhi applies here, as shown in the preceding sutra. Why do we say 'denoting direction'? Observe पूर्वः पाञ्चालानां = पूर्वपञ्चालः, तत्र भवः, = पौर्वपञ्चालकः, आपरपञ्चालकः ॥ With मद्र we have पौर्वमद्रः, आपरमद्रः with अञ् 4.2.108. The separation of this sutra from the last is for the sake of the subsequent sutra.,