RV 7.59.12 त्र्यम्बकं यजामहे सुगन्धि पुष्टिवर्धनम्। उर्वारुकमिव बन्धनान्मृत्योर्मुक्षीय माऽमृतात्। does not have a Padapāṭha.  This is not a repeated mantra in the RV Saṃhitā.  What might be the reason why this mantra does not have a Padapāṭha?  Is it likely that there were a few post-Padapāṭha additions to the RV Saṃhitā?  Someone asked this question on another discussion group.  

Madhav M. Deshpande
Professor Emeritus
Sanskrit and Linguistics
University of Michigan
[Residence: Campbell, California]