A long is substituted for the final vowel of the aṅga (stem) before an affix beginning with y having an indicatory k or ṅ , when it is not a kṛt or a sārvadhātuka affix.,
Thus भृशायते, सुखायते, and दुःखायते with the Denominative affix क्यङ् according to 3.1.12 and 3.1.18. चीयते and स्तूयते with the Passive यक्, चेचीयते and तोष्टूयते with the Intensive यङ्, and चीयात् and स्तूयात् in the Benedictive (See 3.4.116. But प्रकृत्य and प्रहृत्य where the affix ल्यप् is krit, and had the vowel been lengthened by this subsequent rule, the antecedent तुक् augment would have been debarred 6.1.71. And चिनुयात् and सुनुयात् where the Personal endings of the Potential are sarvadhatuka. The phrase क्ङिति is understood in this sutra, so there is no lengthening before non-kit and non-nit affixes, as, उरुया, धृष्णुया, formed by या under 7.1.39.,