@some zatR bases

As these bases are formed with zatR, they are /Rdit.

has हस् + /zatR
→ has हस् + /zap + /zatR by kartarizap
→ has हस् + a अ + at अत्R
→ has हस् + atR अतृ by atoguNe
→ !**hasat- हसत् "that is laughing", which is an /Rdit

dviS द्विष् + /zatR
→ dveS द्वेष् + /zap + /zatR by kartarizap
→ dviS द्विष् + /luk + /zatR by adiprabhRt...
→ dviS द्विष् + atR
→ !**dviSat- द्विषत् "that is hating", which is an /Rdit

bhU भू + /zatR
→ bhU भू + /zap + /zatR by kartarizap
→ bho भो + a अ + at- अत् by gbH
→ bhava भव + at- अत् by ecoyavAyAvaH
→ bhavat- भवत् by atoguNe
→ !**bhavat- भवत् "that is, that becomes"

CAVEAT LECTOR —

This **bhavat- भवत् "that is" formed with /zatR is an /Rdit.

There is another **bhavat'- भवत्ऽॱ, meaning "you", that is an /udit.

Being /udit makes **bhavat'- भवत्ऽॱ form **bhavAn भवान्.