@AT verbbases some

Some examples of vowel-starting roots getting /AT by ADajAdInAm —

Root IkSa~ ईक्षँ darzane दर्शने /bhvAdi "see" with /luG /laG /lRG —

IkS ईक्ष् + /luG
→ IkS ईक्ष् + /sic + /luG by cliluGi and clessic
→ aikS ऐक्ष् + /sic + /luG by ADajAdInAm and ATazca
→ aikS ऐक्ष् + is इस् + /luG by ArdhadhAtuk...
→ !**aikSiS- ऐक्षिष् + /luG, with /Satvam

IkS ईक्ष् + /laG
→ /AT + IkS ईक्ष् + /laG by ADajAdInAm
→ aikS ऐक्ष् + /laG by ATazca
→ IkS ईक्ष् + /zap + /laG by kartarizap
→ !**aikSa- ऐक्षॱ + /laG

IkS ईक्ष् + /lRG /ta
→ AT आट् + IkS ईक्ष् + /ta by ADajAdInAm
→ aikS ऐक्ष् + /lRG by ATazca
→ aikS ऐक्ष् + /sya + /ta by syatAsIlRl...
→ aikS ऐक्ष् + iSya इष्य + /ta by ArdhadhAtuk... and /Satvam
→ !**aikSiSya- ऐक्षिष्यॱ

Root ata~ अतँ sAtatyagamaNe सातत्यगमणे /bhvAdi "keep walking" —

at अत् + /laG
→ At आत् + /laG by ADajAdInAm and ATazca
→ At आत् + /zap + /laG by kartarizap
→ !**Ata- आतॱ + /laG

Root /iN' gatau गतौ /adAdi "go" —

/iN' + flat /laG
→ i इ + /luk + /laG by adiprabhRt...
→ /AT + i इ + /laG by ADajAdInAm
→ !**ai- ऐॱ + /laG by ATazca

as in

!**Ayam आयम् "I went"

!**ait ऐत् "he went"

Root /iG adhyAyane अध्यायने /adAdi "study" —

/iG + bent /lRG
→ /AT + i इ + /lRG by ADajAdInAm
→ ai ऐ + /lRG by ATazca
→ ai ऐ + /sya + /lRG by syatAsIlRl...
→ ai ऐ + sya स्य + /lRG
→ !**aiSya- ऐष्यॱ + /lRG with /Satvam