The affix aṇ comes in the 4-fold sense after a stem having k for its penultimate., This debars अञ् which would have come by 4.2.71 and 4.2.73. Thus कार्णच्छिद्रिकः कूपः ॥ कार्णवाकवम्, त्रैशङ्कवम् ॥,
