ἐπέμψατε ἀγγέλους τοῖς ἀλλήλοις ὥστε ἔγνωτε τὸν κίνδυνον → you sent messengers to one another so that you knew the danger
ἄμπυξ, τροχός, κύκλωμα, ἁψίς, ἀψίς