The affix ini comes after the word pāṇḍukambala etc. being in the Instrumental -3rd case in construction in the sense of 'surrounded' the thing so surrounded being 'a chariot'.,
This debars अण् ॥ Thus पाण्डुकम्बली रथः 'a carriage covered with a white woolen blanket'. The word पाण्डुकम्बल means the housing of a royal elephant. The form पाण्डुकम्बलिन् would have been obtained by the affix इनि of 5.2.115, the present sutra is made in order to debar the affix अण् ॥,