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"See you soon" or "talk to you again soon", or "write to you again soon", or "so long"
Explanation: Literally, it would be "till soon".
The translation will depend on the context. If you expect that friend to come back home soon and meeting with you, you would say "see you soon". But if what he/she means is that he/she will write to you again soon, or phone you again soon, it would be "talk to you again soon" or "write to you again soon". "So long" would be a more colloquial way to say it.