κατὰ τὸν δεύτερον, φασί, πλοῦν τὰ ἐλάχιστα ληπτέον τῶν κακῶν → we must as second best, as people say, take the least of the evils
διειδέναι: inf. к δίοιδα.
(see also διαείδω): decide, know apart
