ἐπέμψατε ἀγγέλους τοῖς ἀλλήλοις ὥστε ἔγνωτε τὸν κίνδυνον → you sent messengers to one another so that you knew the danger
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νῦ ἐφελκυστικόν, or nu euphonic, affixed to the pl. case-ending -σι, to εἴκοσι, -φι, νόσφι, κέ, and to forms of the verb ending in -ε and -ι of the 3d person.