Sūtra 6·3·66
खित्य् अनव्ययस्य
khity anavyayasya
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A short is always substituted for the final of the first member, when the second member is a word formed by an affix having an indicatory kha, but not when the first member is an Indeclinable.
Padapāṭha khiti anavyayasyaखिति अनव्ययस्य