The following words are anomalous - 1. paṅkti 'a verse' 2. viṃśati 'twenty' 3. triṃśat 'thirty' 4.catvāriṃśat 'forty' 5. pañcāśat 'fifty' 6. ṣaṣṭi 'sixty' 7. saptati 'seventy' 8. aśīti 'eighty' 9. navati 'ninety' 10. śatam 'hundred'.,
The words तदस्य परिमाणम् are understood here also : पंक्ति is formed by adding ति to पंच, the final being elided, meaning 'a verse the measure of which is five', i. e. a half-quarter consisting of 5 syllables. The word विंशति is formed by adding शतिच् to the word विन् which replaces the two word द्वयोदशतः as द्वौ दशतौ परिमाणमस्य संघस्य = विंशतिः ॥ So the affix शत् comes after त्रिन् representing त्रयोदशतः; so for चतुर्णो दशतां we have चत्वारिम् and then add शत्, similarly with पंचाशत् ॥ Similarly with the rest.
Note:- All the rest appears to be the conjectural etymology of Patanjali and Kasikakara, and hence it is omitted.
The word पंक्ति also means 'a line'. As ब्राह्मणपङ्क्तिः, पिपीलिका पंक्तिः ॥ Here the sense has no relation to its etymology.,