There are a number in the Maitrī/Maitrāyanī Upaniṣad, e.g. I.4, vanaspatayodbhūta- from vanaspatayaḥ udbhūta > vanaspataya udbhūta- 

I think there’s some discussion of the phenomenon in 

Buitenen, J. A. B. van. The Maitrāyaṇīya Upaniṣad: a critical essay. The Hague: Mouton, 1962.

Valerie J Roebuck

Manchester, UK

On 12 Sep 2016, at 20:26, Martin Gansten <martin.gansten@pbhome.se> wrote:

I seem to recall having read a discussion on instances of irregular, double sandhi (as in, say, vartate idam > vartata idam > vartatedam) on the Indology list, but I can't find it in the list archives. If anyone could point me either to the old posts (assuming that they exist outside my imagination) or to some useful discussion of the phenomenon (does it occur and, if so, where; how is it regarded, etc), I should be most grateful.

Martin Gansten

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