The affix añ comes in the quadruple sense after a word which ends in the affix matup and whose stem is polysyllabic.,
The word बह्वजङ्ग is a compound of बह्वच् meaning literally 'many vowels' i. e. polysyllabic, and of अङ्गः meaning stem. A word which, exclusive of the affix मतुप्, consists of more than two syllables, takes the affix अञ् ॥ This debars अण् ॥ Thus ऐषुकावतम्, सैध्रकावतम् ॥
Why do we say \after a polysyllabic stem\? Observe आहिमतम् यावमतम् ॥ Here though the word अहिमत् ends in the affix मतुप्, yet the अङ्ग or the stem viz. अहि, is a word of two syllables only, hence these words take अण् in forming names of countries. In fact, the word बह्वच् qualifies the word अङ्ग, as it stands without the affix मतुप्, and not the word inclusive of that affix. Therefore मालावतां निवासः = मालावतम् by अण् ॥,