A guttural is not substituted for the final c or j of a root which begins with a guttural, before the affix having an indicatory dh and before ṇyat,
As कूजः, खर्जः and गर्जः with घञ्; कुज्यः, खर्ज्यः and गर्ज्यः with ण्यत् ॥ This is an exception to 7.3.52.,