guṇa is substituted for the final of i and u (with their long) of a reduplicate when the Intensive character yaṅ follows and also when it is elided.,
Thus चेचीयते, लोलूयते with यङ्, and जोहवीति with यङ् लुक् ॥ The ईट् is added in the latter by 7.3.94. So also चोक्रुशीति from क्रुश् 7.3.94 and 7.3.87.,