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according ot this
We will be hosting five closed beta tests for TERA starting February 10, each lasting about 60 hours. Those who have signed up for beta have a chance to be randomly selected to participate in single events. Players who pre-order TERA will gain access to all five closed beta tests and be allowed to retain their characters and their progress for the duration of the closed beta period.
now is this ONLY for people who pre-order from there site ? or if I pre-order from amazon.com can I get into the closed beta's