Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 2 · War Astrology: Yogas, Nakshatras
युद्धजयार्णवः (योगाः नक्षत्राणि)
उऊगजडदबलाः सो वर्गश्च तृतीयकः ।एऐघझढधभवा हो वर्गश्च चतुर्थकः ॥ १८ ॥
In the full Agni Purana this is chapter 125, verse 18.
The third group is u, uu, ga, ja, Da, da, ba, la and sa. The fourth group is e, ai, gha, jha, Dha, dha, bha, va and ha.
Simple meaning: The third and fourth letter groups, nine letters each, are named here.
ओऔअंअः,ङञणना मो वर्गः पञ्चमो भवेत् ।
The fifth letter group is named here. All the groups together have forty-five letters.
बालः कुमारो युवा स्याद्वृद्धो मृत्युश्च नामतः ।
These are the names of the five life stages and of four other states.
मृत्युर्मघा द्वितीया ज्ञो लाभश्चाऽऽर्द्रा च सप्तमी ।
Some mixes of Mercury, moon days and stars bring death or gain.