After a word in the Instrumental -3rd case in construction an affix is added in the sense of 'completed by him' when the whole word so formed is the name of a country.,
The phrase देशे तन्नाम्नि of the last sutra governs this and the two subsequent sutras. By these four sutras the names of countries are formed from various substantives. Thus कुशाम्बेन निर्वृत्ता = कौशाम्बी नगरी \the city of Kausambi, completed by Kusamba\. Similarly साहस्री परिखा \a mote completed by a thousand (gold coins) or persons\. A place is named after the means or the person, by which or through whom it is established.,