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aci ra:: RtaH

अचि र‌ ऋतः ONPANINI 72100

Before vowels, r र् replaces the R ऋ of tisR catasR तिसृ चतसृ.

When these are plural (they most often are), the only vowel endings are /jas and /zas —

tri- त्रिॱ f + /jas OR /zas
→ tisR तिसृ + /jas OR /zas by < tricaturosstr...
→ !**tisras तिस्रस् f "three"

!**catasras चतस्रस् f "four"