2017-05-19 / 07:31 - Καθηγητής_Α Καθηγητής : Welcome! 
2017-05-19 / 07:32 - 1 Φοιτητής : What about exercise 1? 
2017-05-19 / 07:33 - Καθηγητής_Α Καθηγητής : Had already uploaded