sa eṣa: no sandhi (visarga before vowel may be retained in pada)
prāṇo'gniḥ = prāṇaḥ + agniḥ (visarga sandhi: aḥ + a = o' + a)
tadetat = tat + etat (final t + initial e, no change)
tadetaḍṛcā = tadetat + ṛcā (t + ṛ remains, or t becomes ṭ in some traditions)
ṛcā'bhyuktam = ṛcā + abhyuktam (ā + a = ā, apostrophe marks avagraha)
Verse Context
Vaisvanara (Universal Fire) as PranaMahavakya: Not directly one of the four Mahavakyas, but supports the identity of the cosmic and individual principles underlying 'Tat tvam asi' (Chandogya Upanishad 6.8.7) by establishing the unity of macrocosmic Vaisvanara and microcosmic prana.Atharva VedaPippalada (Paippalada) ShakhaChandas: Prose