The affix aṇ (-\/- -a) as well as yat optionally also comes after the word śāṇa , in the ārhīya-senses [[5.1.37]]-63, when preceded by the words dvi and tri,
The यत् comes optionally by the last sutra and is also drawn into this by the word च. Thus we have three forms, द्विशाण्यम्, द्वैशाणम्, and द्विशाणम्, so also त्रिशाण्यम्, त्रैशाणम् and त्रिशाणम् ॥
5.1.37.md''
The irregular Vriddhi of the second term in cases of compounds of numerals, taught in 7.3.15 - 7.3.17, does not however take place in the case of शाण, this word being especially excluded from the operation of those rules, see 7.3.17. The Vriddhi here is regular as taught by the general rule 7.2.117.,