Natyashastra
आद्यः पृष्ठापसर्पी च स च चाषगतिर्भवेत् । अड्डितश्च पुनर्वाम आद्यश्चैवापसर्पितः ॥ ५९॥
The first movement is the back-sliding motion, followed by the crane-like movement. Then, the leftward opening is followed by the back-sliding motion.
english translation
AdyaH pRSThApasarpI ca sa ca cASagatirbhavet । aDDitazca punarvAma AdyazcaivApasarpitaH ॥ 59॥
hk transliteration by Sanscript