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How do I withdraw SBD to an exchange?

https://steemit.com/bittrex/@blocktalk/how-to-send-steem-dollars-from-steemit-com-to-bittrex-exchange . I think this is the article you need to solve your problem. It was written nicely by @blocktalk

Thank you the article really helped and I just discovered the internal market. So it all makes sense now.