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dIrgho laghoH

दीर्घो लघोः ONPANINI 74094

Lengthen (the /abhyAsa vowel of what is before /caG) if it is light (and before a light).

Addition to < sanvallaghun....

So from kAmayate कामयते ← kam कम् + /Ni + /luG we get —

kAmi कामि + /caG + /ta
→ **acIkamata अचीकमत, with long cI ची

Why do we say "if it is light"?

When before a cluster, the abhyAsa vowel is heavy, and does not lengthen —

!**ababhrajat अबभ्रजत्

Why do we say "if it is before a light"?

In acIkamata अचीकमत the /abhyAsa is before the light a अ of kam. But here the /abhyAsa ra र is before the heavy a अ of rakS रक्ष्, and there is no lengthening —

**ararakSat अररक्षत्