Natyashastra
कलिकं द्विकलं वापि न वा स्यात्प्रत्युपोहनम् । द्विकलैर्गुर्वक्षरकृतैः पादभानैर्यथाक्रमम् ॥ २२१॥
Neither the single Kalā nor the double Kalā is used for the Pratyupohana. The twofold Kalās, made with heavy syllables, are to be arranged in the Pādabhāgas in proper sequence.
english translation
kalikaM dvikalaM vApi na vA syAtpratyupohanam । dvikalairgurvakSarakRtaiH pAdabhAnairyathAkramam ॥ 221॥
hk transliteration by Sanscript