पूरणगुणसुहितार्थसदव्ययतव्यसमानाधिकरणेन

A word ending in a sixth case-affix is not compounded with a word having the sense of an ordinal, an attribute, or satisfaction, or with a participle ending in the suffix सत् 3.2127, or an indeclinable, or ending with the affix तव्य , or with a word denoting the same object (i.e. when they are in apposition).
The word 'artha' joins with all the first three words, as (1) छात्राणां पंचम. 'fifth amongst the pupils;' छात्राणां दशम. (2) काकस्य कार्ष्ण्यम् 'the blackness of the crow,' वलाकायाः शौक्ल्यम्. (3) फलानां सुहितः 'satisfied of fruits; फलानां तृप्तः. (4) ब्राह्मणस्य कुर्वन् 'the doing of a Brahmana ; ब्राह्मणस्य कुर्वाणः 'the doing of a Brahmana'. (5) ब्राह्मणस्य कृत्वा 'being done of Brahmana,' ब्राह्मणस्य हुत्वा. (6) ब्राह्मणस्य कर्तव्यम्. When however the affix is तव्यम् having the indicatory त् 3.1.96 there is compounding as ब्राह्मणकर्तव्यं 'the Brahmana's duty' (7) राज्ञः पाटलिपुत्रकस्य 'of the king Pataliputraka' पाणिनेः सूत्रकारस्य 'of the sutra composer Panini. We can however form a compound like the following a सूत्रकारपाणिनिः । By the general rule relating to words in apposition contained in sūtra 2.1.57, the difference between that sutra_ and the present, is as to position of the words. In the genitive compound the genitive word would have stood first if compounded; not so in the other, there the quality stands first.