διὰ νήσων τὸν πλόον ἐποιεῦντο → they kept sailing through the islands
subs.
P. and V. λύσις, ἡ, ἀπαλλαγή, ή, V. ἔκλυσις, ἡ, P. ἀπόλυσις, ἡ, ἐλευθέρωσις, ἡ.