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rAyo hali रायो हलि ONPANINI 72085

/rai- turns into rA- राॱ before consonant /sup.

The base rai- रैॱ f means "wealth" or "an item of wealth". It is said to be the only base ending in ai ऐ.

Before a consonant /sup it turns into rA रा by this sUtra —

/rai- + /su → rAH राः " s wealth"
/rai- + /sup'
→ rAsu रासु "in items of wealth"
rAbhyAm राभ्याम्
rAbhiH राभिः
rAbhyaH राभ्यः

Before vowel /sup we get rAy- राय् by ecoyavAyAvaH —

/rai- + /au → !**rAyau रायौ

/rai- + /am → !**rAyam रायम्

/rai- + /Am → !**rAyAm रायाम्

/rai- + /jas OR /zas → !**rAyaH रायः

Why do we say before a /sup?

The /rai- stays unchanged before a /taddhita —

/rai- + /tva + /su → raitvam रैत्वम् "wealthiness" (wealth status) / "wealthness" (state of being wealth)

When /rai- is neuter in a genderbender, it becomes ri रि —

ati-rai- अतिॱरैॱ n + /su OR /am → **atiri अतिरि

as in

atiri kulam अतिरि कुलम् "super-rich family".

If /rai- is the only nounbase ending in ai ऐ, what's the use of the r र् in this sUtra? It might have been Ayohali आयोहलि and it would work the same.

This r र् tells us that other /pANini did not think that /rai- was the only nounbase ending in ai ऐ, or he thought that some might be added in the future. In either case, this rule won't apply to the other ai ऐ-enders —

jedair DAmaras saH जेदैर्डामरः सः "he's a Jedai knight"
sAmudrikaF papair asmi सामुद्रिक⩆ पपैरस्मि "I'm Papai the sailor"