3.1 is concerned with suffixes and starts off with talking about san when abhyAsa-kaarya of verbs e.g. how kR kR san leads to chikIrSati. 3.1.8 starts with kyac suffix{1}. 3.1.25 is concerned with Nic suffix{2}. 3.1.26-3.1.31 describe iiyan, aay in the same context. 3.1.33-3.1.40 - describe combinations with liT. 3.1.41- 3.1.59 sutras describe chan for chli in lun, 3.1.60-3.1.66 describe ciN for chli in lun. 3.1.66 starts with a widely applicable yak suffix (in the context of lakaaras). 3.1.68 indicates shap, 3.1.69 shyan, 3.1.77 shaH, 3.1.78 shnam - visiting the general category of saarvadhaatuka suffixes. 3.1.87 talks about कर्म-like cases - a discussion that ends at 3.1.90. tavyat-related suffixes are mentioned thereafter (3.1.96) - yat is conditionally implied for many cases. Rules 3.1.106 -3.1.132 discuss application of kyap.
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1. A reminiscence of this suffix is still present in the bhojpuri language of central India e.g. acting like a professor may be referred to as professoriana - a sort of mutilation that is not allowed in the more dominant languages of the region.
2. A particular characteristic of current Hindi grammar seems to be a descendant of Nic. In Hindi, to have someone write (likhanaa) for you is likhavaanaa.