One should not learn the language (mode of speech) of the alien tribe; one should not drag a seat by means of the leg; one should not create dissension (among friends). One should not crack the finger joints or snap the fingers; one should not cut or scrape aimlessly. The sensible man should not thrash suddenly or aimlessly. One should not keep food on the lap while eating; one should not indulge in purposeless movements of the limbs.