The above numerals, when taking a case-affix beginning with a bhas or s , get the acute accent on the penultimate syllable, when the said numerals assume a form consisting of three or more syllables.,
The numerals षट्, त्रि and चतुर् when ending in a case-affix beginning with a झल् consonant, form a full word (पद), in such a word the penultimate syllable gets the acute accent. The very word penultimate shows that the पद must be of three syllables at least. Thus पंच꣡भिः, सप्त꣡भिः, तिसॄ꣡भिः, चतु꣡र्भिः ॥ Why do we say 'beginning with भ् and स्'? Observe पंचाना꣡म्, सप्तानाम् ॥
Why do we say 'the penultimate syllable'? Observe षड्भिः꣡, षड्भ्यः꣡ ॥,