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I accidentaly booked my tickets for 2 travels twice. Can I get a full refund for one of these sets of tickets?

My tickets are from Amsterdam to Munich, for 2 people for Oct. 17, 2016. I received two different order numbers ******* and *******. Both order numbers say they are for 2 people. I need a refund on one of these orders and am not sure how to go about doing that.

[Edited by DB Bahn, 24. September 2016, 10:51 am: Order ID's blinded]