deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE
The /tu are
t त् th थ् d द् dh ध् n न्
(by aNuditsav...).
They are also called ta त-/varga.
There is also an enclitic /tu' that means "but".
The dentals or /dantya os /stu are the /tu plus s स्.