The affix ṅīp comes in the feminine after a bahuvrīhi samāsa ending in the word ūdhas 'an udder', beginning with a Numeral or indeclinable.,
This sutra ordains 'nip', where by the last sutra there would have been 'nish'. Thus द्वी + ऊधस् + अनङ् + ङीप् 5.4.131 = द्व्यूध्नी 'having two udders'; so also त्र्यूध्नी, 'having three udders'. The above are Bahuvrihi compounds beginning with a Numeral. Similarly अत्यूध्नी 'many-uddered.; निरूध्नी 'having no udders'.
Why do we say 'beginning with'? So that the rule may apply to compounds like द्विविधोध्नी and त्रिविधोध्नी, in which the words 'dvividha' and 'trividha', though not Sankhya are words which begin with a Sankhya.,