आर्यो ब्राह्मणकुमारयोः

Operational rule vidhi

The word आर्य optionally retains its original accent in a कर्मधारय समास before the words ब्राह्मण and कुमार.

Word by word (padaccheda)

Substitute / term आर्यः prathamā · ekavacanaRight context ब्राह्मण- कुमारयोः saptamī · dvivacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").

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Full reading

आर्यः ब्राह्मण-कुमारयोः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The word आर्य optionally retains its original accent in a कर्मधारय समास before the words ब्राह्मण and कुमार।
Thus आर्य॑ब्राह्मणः or आर्यबाह्मणः꣡, आर्य॑कुमारः or आर्यकुमारः꣡ ॥ The word आर्य is formed by ण्यत् affix and has svarita on the final. Why do we say 'Arya'? Observe परमब्राह्मणः꣡, परमकुमारः꣡ ॥ Why do we say before 'Brahmana' and 'Kumara'? Observe आर्यक्षत्रियः ॥ Why 'Karmadharaya ?' Observe आर्यस्य ब्राह्मणः = आर्यब्राह्मणः꣡ ॥ According to the Accentuated Text the accent is आ꣡र्य (Pro. Bohtlingk).

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.