Paraskaragrihyasutra 1.17.2

1.17.2

dvyakṣaraṃ caturakṣaraṃ vā ghoṣavadādyantarantasthaṃ dīrghābhiniṣṭhānaṃ kṛtaṃ kuryānna taddhitam \2\

Of two syllables, or of four syllables beginning with a sonant, with a semivowel in it, with a long vowel (or) the Visarga (at its end), with a Krit (suffix), not with a Taddhita;