The elision of u is invariable before v and m in the case of kṛ 'to make' (karoti).,
Thus कुर्वः and कुर्मः ॥ Thus कृ + उ + व = कुर् + उ + वः 6.4.110 = कुर् + ० + वः 6.4.108. Now the lopa being not sthanivat, when a vowel is to be lengthened 1.1.58, उ of कु should be lengthened by 8.2.77. This contingency is prevented by 8.2.79.,