@tryahaH derivation

/Tac is a /samAsAnta affix. The /Tit is for TiDDhANaJdvay... and the /cit is for citaH.

An example of a /Tac word is **tryaha- त्र्यहॱ "threeday", "group of three days".

trINy ahAni samAhRte त्रीण्यहानि समाहृते "three days"
→ tri- त्रिॱ + /jas + /ahan''- + /jas
→ tri- त्रिॱ + /ahan''- n + /jas by supodhAtupr...
→ tri- त्रिॱ + ahan- अहन् + /su by dvigurekav...
→ (ahnohna::et... won't work here because of nasaGkhyAdess...)
→ tryahan- त्र्यहन् + /su by ikoyaNaci
→ tryahan- त्र्यहन् + /Tac + /su by rAjAhassakh...
→ tryah- त्र्यह् + /Tac + /su by ahnaSTakhor...
→ tryaha- त्र्यहॱ m + /su by rAtrAhnAhAHp...
→ !**tryaha- त्र्यहॱ m + /su → tryahaH त्र्यहः "a group of three days"

dve:: ahanI samAhRte द्वे‌ अहनी समाहृते
→ !**dvyaha- द्व्यहॱ, same steps as **tryaha- त्र्यहॱ