Hong said Chen Fake taught, "Taijiquan is learned according to the rules (规矩, gui ju)." In this regard, theoretically, the Practical Method aligns closely with the writings of Chen Xin and, hence, Xiaojia, except that one foot is allowed to turn outward 45° so that both hips (kua, 胯) may stay open to round the crotch. Pragmatic oral instructions were passed from Chen Fake to illuminate theoretical principles, such as: Lead inward with the elbow do not lead inward with the hand; Go out with the hand do not go out with the elbow. (收肘不收手，出手不出, Shōu zhǒu bù shōu shǒu, chū shǒu bù chū zhǒu.); Only rotate don't move. (只转不动, Zhǐ zhuǎn bù dòng); Better to advance one hair than to retreat one foot. (宁进一毫，不退一尺, Níng jìn yī háo, bù tuì yī chǐ); and many others.