krūraṃ yad amedhyaṃ yad aśāntaṃ tadapagacchatād ḥ apa gacchatād iti   apsu nimajjyaunmajjya   naapsu sataḥ prayamaṇaṃ vidyate na vāsaḥpalpūlanaṃnaupasparśanam   yady uparuddhāḥ syur etenaupatiṣṭhate  