The word āṅ when signifying limit exclusive or limit inclusive, may optionally be compounded with a word ending in the 5th case and the compound so formed is called avyayībhāva,
As, आपाटलिपुत्रं or आपाटलिपुत्रात् दृष्टो देवः 'it rained up to Pátaliputra.' आकुकरं or आकुपरिभ्यो यशः पाणिनेः 'the fame of Panini extends even to the boys.',