The i and ī of these affixes (iman and īyas) are elided after bahu , and for bahu is substituted bhū,
Thus भूयान्, भूमा ॥ In the case of इष्ठ, the following rule 159 will apply. Under (I. I. 54) and 1.1.67, बहोः being in the Ablative, the first letter of the succeeding term is elided, viz. इ or ई; in this case. बहु belongs to Prithvadi class and takes इमन् affix. 5.1.122 The repetition of बहोः is for the sake of pointing out the sthani, for which the word भू is to be substituted : otherwise भू would have replaced these affixes.,