Natyashastra
प्रवृत्तं विवधं वापि तस्मात्पादौ प्रयोजयेत् । सप्ताङ्गं द्वादशाङ्गं वा प्राक्षमोवेणकं बुधैः ॥ १९३॥
The Pravṛtta and Vivadha should be applied to the Pādas. The Oveṇaka is to be arranged by the experts either with seven limbs or with twelve limbs.
english translation
pravRttaM vivadhaM vApi tasmAtpAdau prayojayet । saptAGgaM dvAdazAGgaM vA prAkSamoveNakaM budhaiH ॥ 193॥
hk transliteration by Sanscript