The affix kha (īna) comes in the ārhīya senses [[5.1.37]]-63 after the word viṃśatika , when preceded by the word adhyarddha or a Numeral, occasioning a dvigu,
Thus अध्यर्द्धविंशतिकीनम्, द्विविंशतिकीनम् and त्रिविंशतिकीनम् ॥ Being especially ordained, this affix ख is not elided by 5.1.28.,