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ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
v. ἀναπίπτω.
ἀνέπεσον: поздн. ἀνέπεσα aor. к ἀναπίπτω.