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Au revoir - Until next time/Goodbye ~
A tout a l’heure - See you soon within the hour ~
A bientot - See you soon within the day ~
A demain - See you tomorrow ~
A plus tard - See you later ~
Bon week-end - Have a good weekend ~
A’ la prochaine - See you next time ~
A’ Lundi - See you Monday ~
Bonne Journée - Have a good day
What are informal & formal goodbyes?