The affix aṇ also (as well as ḍhañ ) comes after the word grīvā in the sense of 'what stays there'.,
This debars यत् 4.3.55 ग्रीवासु भवं = ग्रवेयम् or ग्रैवम् ॥ The word ग्रीवा means blood-vessels, and as they are many, the word is used in the plural in the sutra.,