I am puzzled by a curious feature of Sanskrit versification, syntax and sandhis.  While sandhis are supposed to take place between pādas 1 and 2, and between 3 and 4, the enclitic forms such as ते and मे, as they come under the Pāṇinian restriction of अपादादौ cannot occur at the beginning of any pādas.  I am looking for any serious discussion or research on these features, and whether forms like ते and मे do occur at the beginning of pādas 2 and 4 in known Vedic or post-Vedic literature.  I will appreciate any help you can provide.  With best wishes,