ἄνω ποταμῶν ἱερῶν χωροῦσι παγαί → the springs of sacred rivers flow upward, backward to their sources flow the streams of holy rivers
not clearly: P. ἀσαφῶς, Ar. and V. δυσκρίτως.
doubtfully: P. ἐνδοιαστῶς, V. ἀμφιλέκτως.