वरिवस्यारहस्य (भास्करराय मखी - सरोजिनी हिन्दी व्याख्या, कामकला व श्रीविद्या मन्त्र-दर्शन)

"? It's "ब्रह्मविष्णुपरो" or "परौ"?
Wait, ककारैकारौ is dual masculine (dvandva, tau), so the adjective must be "ब्रह्मविष्णुपराै" -> "ब्रह्मविष्णुपरो" with an extra slant, i.e., "परौ". Wait, look at 'रो' in 'ककारैकारौ': 'रौ' has one vertical and two slants.
Look at 'परो' / 'परौ': it has one vertical and two slants! So it is "परौ"!
Wait, let's look at the first part: "ब्रह्मविष्णुपराै"? No, "ब्रह्मविष्णू"?
Look at 'विष्णु': it's 'विष्णु' with short u? No, look at the hook below 'ष्ण': it's short u: "ब्रह्मविष्णुपराै" or "ब्रह्मविष्णुपरो"?
Wait, let's look at L28 again:
"इति चैकाक्षरनिघण्टूक्तब्रह्मविष्णुपरो ककारैकारौ" or "ब्रह्मविष्णुपराै ककारैकारौ"? It looks like "ब्रह्मविष्णुपराै" with a typo or "ब्रह्मविष्णुपरो". Let's look at the matra: it's definitely 'ौ' or 'ो' - wait, in "ककारैकारौ", it has 'ौ'. Before that, "ब्रह्मवि