The final vowel of the preceding member is lengthened before añca when it assumes the form ca having lost its nasal and the vowel.,
Thus दधीचः पश्य, दधीचा, दधीचे, मधूचः पश्य, मधूचा, मधूचे ॥ The nasal of अञ्च is elided by 6.4.24, and the अ by 6.4.138. In दधि + अच् the इ is not changed to its semivowel, though that is an antaranga rule, because the present sutra ordains specifically long ई, and so also दधी + अच् and मधू + अच् ॥ See also 6.3.92.,