Up to sutra [[5.1.115]] (excluding that) the affix ṭhañ (+\/- ika or +\/- ka) bears rule.,
The affix ठञ् governs all the succeeding sutras upto तेन त्य्ल्यं क्रिय चेद्वात, and has the senses given to it in Sutras 5.1.37 &c. Strictly speaking the affix ठञ् governs only upto 5.1.110 and not upto 5.1.115. Thus in Sutra 5.1.72, the affix ठञ् must be read as पारायणिकः, तौरायणिकः, चान्द्रायणिकः ॥,