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tvAhau sau त्वाहौ सौ ONPANINI 72094

Before /su, (replace /yuSm /asm) with tva त्व aha अह.

There are only two examples of this rule. The noun /aham mf means "I". The noun /tvam mf means "thou" (you', when addressing one person, and when it has first ending). They are formed like this —

/yuSmad- + /su
→ yuSma युष्म + /su by <<<< zeSelopaH
→ tva त्व + a अ + /su by this rule
→ tva त्व + /su by atoguNe
→ tva त्व + /am by Geprathamay...
→ tvam त्वम् by amipUrvaH
→ !**tvam त्वम् "you'"

/asmad- + /su
→ yuSma युष्म + /su by <<<< zeSelopaH
→ aha अह + a अ + /su by this rule
→ aha अह + /su by atoguNe
→ aha अह + /am by Geprathamay...
→ aha अह + m म् by amipUrvaH
→ !**aham अहम् "I"